1. Ager, D. V.: Principles of Paleoecology. pp. 371. McGraw-Hill Book Comp. Inc., New York 1963.
2. Ager, D. V.: Mesozoic brachiopod migrations and the opening of the North Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology 21, 85–99 (1977)
3. Bogush, O. Y.: Middle-Late Carboniferous Foraminifera and Stratigraphy in the East of Aleysk Mts. Akad. Nauk SSSR, Geol. and Geophy. Inst., Sib. Branch (in Russian), 1963.
4. Bogush, O. Y. et al.: Permo-Carboniferous Foraminifera of Verkhoyan. Acad. Nauk SSSR, Geol. and Geophy. Inst., Sib. Branch (in Russian), 1966.
5. Chaloner, W. G.: The Carboniferous upland flora. Geol. Mag. 95, 261–262 (1958)