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1 — ARNOLD, C. A. (1950) : Megaspores from the Michigan Coal Basin. Contr. Mus. Paleont. Univ., Mich., Vol. V, No. 5, pp. 59-111.

2 — ARTÜZ, S. (1957) : Die Sporae dispersae der Turkischen Steinkohle von Zonguldak-Gebiet (mit besonderer Beachtung der neuen Arten und Genera), Sdrie B. Tome XXII, Fasc. 4, Istanbul.

3 — BENN1E, I. and KIDSTON, R. (1886): On the Occurrence of Spores in the Carboniferous Formation of Scotland. Proc. Royal. Phys. Soc. Edinb, Vol. IX.

4 — BONET, M. C. y DIJKSTRA, S. J. (1956) : Megasporas Carboniferas de la Camocha. Intiluto de invesligaciones Geologicas Lucas Mallada, Madrid.

5 — BHARDWAJ, C. D. (1957) : The Palynological investigations of the Saar Coals. Paleontographica, Abt. B, Vol. 101, Liefg. 5-6, pp. 73-125, Stuttgart.

6 — BlLGUTAY, U. (1959) : The Permian Calcareous Algae from southeastern Anatolia. M. T. A. Bull. No. 52, pp. 48-59, Ankara.

7 — Chaloner, W. G. (1951) : On Spencerisporites, gen. nov., and S. karczcwskit (Zerndt), the isolated spores of Spencerites insignis Scott. Ann. Mag. Nat. Hist. T. IV, Ser. 12, pp 861-873. London.

8 (1952) : On Lepidocarbon Waltoni, sp. n. from the Lower Carboniferous of Scotland. Ann. Mag. Nat. Hist., T. V, Ser. 12, page 572-582, 1 pl., London.

9 — (1953) : A new species of Lepidostrobus containing unusual Spores. Geol. Mag. pp. 90, 97-11, pl. 2.

10 (1954) : Mississipian Megaspores from Michigan and adjacent states. Contr, Mas. Paleont, Univ. Mich., Vol. XII, No. 3, pp. 23-35.

11 (1954) : Notes on the Spores of two British Carboniferous Lycopedes. Ann. Mag. Nat. Hist. 7. 8191, 10 Figs, London:

12 — DTJKSTRA, S. J. and P. H. Van VIERSSEN TRIP. (1946) : Eine monographische Bearbeitung der karbonischen Megasporen Med. Geol. Sticht. Ser. C-III 1, pp. 1-101, Maastricht.

13 — DIJKSTRA. S J. (1949) : Megaspores and some other small fossils from the Aachenian (Senonian) in South Limburg, Netherlands. Med. Geol. Sticht. Nw. Ser., Vol. III, pp. 19-33. Maastricht.

14 (1949) : La signification stratigraphique des Spores. Soc. Geol. de Belgique. T. L XXII, fascicule special.

15 (1950) : Carboniferous Megaspores in Tertiary and Quaternary Deposits of S. E. England. Ann. Mag. Nat. Hist. London, Ser. 12, Vol. III, pp. 865-887:

16 — (1951) : Wealden Megaspores and their stratigraphical value. Med. Geol. Sticht., Nw. Ser., Vol. V, pp. 7-21, Maastricht.

17 (1952a) : Megaspores of the Turkish Carboniferous and their stratigraphical value. Int. Geol. Congr. Report XVIII th Session, part. X Proc. of Sect. J. pp. 11-17.

18 (1952b) ,: New Carboniferous Megaspores from Turkey. Ann. Mag. Nat. Hist. London, Ser. 12, Vol. V, pp. 102-104.

19 — (1952 c) : The stratigraphical value of Megaspores. 3. Congr. Strat. Geol. Carb., Heerlen, pp. 163-168.

20 — (1955) : The Megaspores of the Westphalian D and C. Med, Geol, Sticht. Nw. Ser. 8, pp. 5-11.

21 — DIJKSTRA, S. J. (1955) : La correlation des veines de charbon paries Megaspores. Publ. Ass. Etud. Paleont., Brux., No. 21, Hors Ser. Vol. VIII, pp. 107-119.

22 (1955) : Megaspores carboniferas espanolas y su empleo en la correlacion estratigrafica (With English summary). Estudios Geol., No. 27, 28, Vol. XI, pp. 277-354, Madrid.

23 (1956) : Some Brezilian Megaspores, Lower Permian in age, and their comparison with Lower Gondwana Spores from India. Med. Geol. Sticht., Nw. Ser., Vol. IX, pp. 6, Maastricht.

24 (1956) : Lower Carboniferous Megaspores. Med. Geol. Sticht., Nw. Ser., Vol 10, pp. 5- 18.

25 — DIJKSTRA, S. J. and PIERART, P. (1957) : Lower Carboniferous Megaspores from the Moscow Basin. Med. Geol. Sticht., Nw. Ser, Vol. XI, pp. 5-19.

26 — İBRAHİM, A. G. (1933) : Sporenformen des Agirhorizontes des Ruhr-Reviers. Dissertation Berlin 1932, 46 S, 8 Tafeln. Konrad Triltsch, Würzburg.

27 — KALIBOVA, M. (1951) : Megaspores of the Radnice Coal Measure Zone of the KladnoRakovnik Goal Basin. Geol. Surv. Czechoslovakia, 18 (Pal.), 21-83, Tafeln 5-8, Prag.

28 — POTONIE, R., und KREMP, G. (1955) : Die Sporae dwpersae des Ruhrkarbons.-Teil I und II Sonder. Abdruck aus Palaeontographica, Bd. 98 und 99, Abt. B, Hannover.

29 — PIERART, P. (1956) : Quelques megaspores continues dans les charbons stephaniens des bassins de Blanzy et de Decazeville.

30 — SCHOPF, J. (1936) : Spores characteristic of Illinois coal No. 6. Trans. Illinois State Acad. Sci. 28, No. 2, 173-176, Urbana.

31 — (1938) : Spores from the Herrin (No. 6) Coal bed in Illinois. Report of Invest. No. 50 of the Geol. Surv. of Illinois. 25, 8 pis. Urbana.

32 — STACK, E. UND ZERNDT, J (1931) : Die Sporen in dem Flamm-, Gastflamm - und Gaskohlen des Ruhrkarbons. Glückauf, 67, 1118-1124, Essen.

33 — WICHER, C. A. (1931) ; Über Abortiverscheinungen bei fossilen Sporen und ihre phylogenetische Bcdeutung. Arb Inst. Paldobot Petrogr. Brennst. 5,87-96, Preuss Geol L. — A. Berlin.

34 — ZERNDT, J. (1930) : Petrograficzne badania weglia z Podladu «Izabella» W Trzebini. Przegladu Gorniczo-Putniczaga Dabrow Goru Humiezego, 1-4, 5 Taleln.

35 — (1932) : Megasporen aus den Zwickauer und Lugau-Ölsnitzer Karbon. Jahresber. Berg und Hüttenwesen in Sachsen, 9-16,4 Tafeln, Freiberg.

36 — (1934) : Les Megaspores du bassin houiller Polonais I. Bull, de l'Acad. Pol. des Sci. et des Lettres Trav. Geol., 1-56,32 Tafeln. Krakau.

37 — (1937) : Les Megaspores du bassin houiller Polonais. II. Bull, de l'Acad. Pol. des Sci. et des Lettres 1-78,241-2 78, Krakau.

38 — (1938) : Die Eignung von Megasporen als Leitfossilien. II. Carbon-Congr. Heerlen, 1935, Compte Rendu 3, 1711-1732, Maastricht.

39 — (1939) : Sprawozdanie z baden Megaspore. Przycznki do Geologii, Polski, 1-4.

40 — (1940) : Megasporen de; Saarkarbons. Palaeontographica 84, Abt. B, 133-150. Tafeln 9-13, Stuttgart.

41 — YAHŞIMAN, K. and ERGÖNÜL, Y. (1958) : The Sporological investigation and correlation of the coal seams in the Gallery E. K. 1. Amasra (Tarlaağzı). M. T. A. Bull. No. 51, p. 42, Ankara (in Turkish)

42 — YAHŞIMAN, K. (1956) : About the stratigraphical age of the Azdavay coals. M. T. A. Bull. No. 48, p. 140 (in Turkish)