APA (7th ed.) Citation

Auer, M. (1991). The preservation of historic signs. U.S. Department of the Interior, National Park Service, Cultural Resources, Preservation Assistance.

Chicago Style (17th ed.) Citation

Auer, Michael. The Preservation of Historic Signs. Washington, D.C.: U.S. Department of the Interior, National Park Service, Cultural Resources, Preservation Assistance, 1991.

MLA (9th ed.) Citation

Auer, Michael. The Preservation of Historic Signs. U.S. Department of the Interior, National Park Service, Cultural Resources, Preservation Assistance, 1991.