APA (7th ed.) Citation

Riggs, E. S. (1933). Preliminary description of a new marsupial saber-tooth from the Pliocene of Argentina. [publisher not identified].

Chicago Style (17th ed.) Citation

Riggs, Elmer S. Preliminary Description of a New Marsupial Saber-tooth from the Pliocene of Argentina. Chicago: [publisher not identified], 1933.

MLA (9th ed.) Citation

Riggs, Elmer S. Preliminary Description of a New Marsupial Saber-tooth from the Pliocene of Argentina. [publisher not identified], 1933.

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