Cita APA (7th ed.)

Gale Group & Friedman, L. S. (2012). Endangered species. Greenhaven Press.

Cita Chicago (17th ed.)

Gale Group i Lauri S. Friedman. Endangered Species. Detroit, Mich: Greenhaven Press, 2012.

Cita MLA (8th ed.)

Gale Group i Lauri S. Friedman. Endangered Species. Greenhaven Press, 2012.