APA (7th ed.) Citation

Mamay, S. H. (1968). Russellites, new genus, a problematical plant from the Lower Permian of Texas. U.S. Govt. Print. OFf.

Chicago Style (17th ed.) Citation

Mamay, Sergius H. Russellites, New Genus, a Problematical Plant from the Lower Permian of Texas. Washington: U.S. Govt. Print. OFf, 1968.

MLA (9th ed.) Citation

Mamay, Sergius H. Russellites, New Genus, a Problematical Plant from the Lower Permian of Texas. U.S. Govt. Print. OFf, 1968.