APA Citation

Mamay, S. H. 1. (1976). Paleozoic origin of the cycads. Washington: United States Government Printing Office.

Chicago Style Citation

Mamay, Sergius H. 1920-2008. Paleozoic Origin of the Cycads. Washington: United States Government Printing Office, 1976.

MLA Citation

Mamay, Sergius H. 1920-2008. Paleozoic Origin of the Cycads. Washington: United States Government Printing Office, 1976.

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