APA (7th ed.) Citation

Mamay, S. H. (1976). Paleozoic origin of the cycads.

Chicago Style (17th ed.) Citation

Mamay, Sergius H. Paleozoic Origin of the Cycads. 1976.

MLA (9th ed.) Citation

Mamay, Sergius H. Paleozoic Origin of the Cycads. 1976.

Warning: These citations may not always be 100% accurate.