Cita APA

(1990). Managing national park system resources: A handbook on legal duties, opportunities, and tools. [S.l.]: Washington, D.C..

Citación estilo Chicago

Managing National Park System Resources: A Handbook On Legal Duties, Opportunities, and Tools. [S.l.]: Washington, D.C., 1990.

Cita MLA

Managing National Park System Resources: A Handbook On Legal Duties, Opportunities, and Tools. [S.l.]: Washington, D.C., 1990.