Cita APA (7a ed.)

Simpson, G. G. (1981). Notes on some fossil penguins, including a new genus from Patagonia.

Cita Chicago Style (17a ed.)

Simpson, George Gaylord. Notes on Some Fossil Penguins, Including a New Genus from Patagonia. 1981.

Cita MLA (8a ed.)

Simpson, George Gaylord. Notes on Some Fossil Penguins, Including a New Genus from Patagonia. 1981.