Cita APA (7th ed.)

(1978). Gray wolf essential habitat, Northern Region / U.S. Department of Agriculture, Forest Service.

Cita Chicago (17th ed.)

Gray Wolf Essential Habitat, Northern Region / U.S. Department of Agriculture, Forest Service. 1978.

Cita MLA (9th ed.)

Gray Wolf Essential Habitat, Northern Region / U.S. Department of Agriculture, Forest Service. 1978.

Atenció: Aquestes cites poden no estar 100% correctes.