APA (7th ed.) Citation

Rigby, J. F. (1969). Permian sphenopsids from Antarctica. U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Rigby, J. F. Permian Sphenopsids from Antarctica. Washington: U.S. Govt. Print. Off, 1969.

MLA (9th ed.) Citation

Rigby, J. F. Permian Sphenopsids from Antarctica. U.S. Govt. Print. Off, 1969.

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