Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Precaución: Estas citas no son 100% exactas.