Cita APA (7th ed.)

SIMPSON, G. G. (1964). Life of the past: An introductionto paleontology. YaleUniversity.

Cita Chicago (17th ed.)

SIMPSON, George Gaylord. Life of the Past: An Introductionto Paleontology. London: YaleUniversity, 1964.

Cita MLA (9th ed.)

SIMPSON, George Gaylord. Life of the Past: An Introductionto Paleontology. YaleUniversity, 1964.