Cita APA (7a ed.)

Porfirio, c. 2. 3., & Clark, G. (2000). On abstinence from killing animals. Cornell University Press.

Cita Chicago Style (17a ed.)

Porfirio, ca. 234-ca. 305, y Gillian Clark. On Abstinence from Killing Animals. Ithaca (New York): Cornell University Press, 2000.

Cita MLA (9a ed.)

Porfirio, ca. 234-ca. 305, y Gillian Clark. On Abstinence from Killing Animals. Cornell University Press, 2000.