Cita APA (7th ed.)

Benson, S., & Nagel, R. E. s. Endangered species.

Cita Chicago (17th ed.)

Benson, Sonia, i Rob. Endangered species Nagel. Endangered Species.

Cita MLA (9th ed.)

Benson, Sonia, i Rob. Endangered species Nagel. Endangered Species.

Atenció: Aquestes cites poden no estar 100% correctes.