APA (7th ed.) Citation

International Geological Congress Prag & Hejtman, B. (1968). Report of the twenty-third session, Czechoslovakia 1968. Academia.

Chicago Style (17th ed.) Citation

International Geological Congress Prag and Bohuslav Hejtman. Report of the Twenty-third Session, Czechoslovakia 1968. Prague: Academia, 1968.

MLA (9th ed.) Citation

International Geological Congress Prag and Bohuslav Hejtman. Report of the Twenty-third Session, Czechoslovakia 1968. Academia, 1968.