Cita APA (7th ed.)

National Parks and Conservation Association. (1986). Promised land: National parks keep faith with visitors and hard-pressed wildlife. The Association.

Cita Chicago (17th ed.)

National Parks and Conservation Association. Promised Land: National Parks Keep Faith with Visitors and Hard-pressed Wildlife. Washington, D.C.: The Association, 1986.

Cita MLA (8th ed.)

National Parks and Conservation Association. Promised Land: National Parks Keep Faith with Visitors and Hard-pressed Wildlife. The Association, 1986.