APA (7th ed.) Citation

Tilberg, F. (1962). Gettysburg National Military Park, Pennsylvania (Rev. ed.). U.S. Dept. of the Interior, National Park Service.

Chicago Style (17th ed.) Citation

Tilberg, Frederick. Gettysburg National Military Park, Pennsylvania. Rev. ed. Washington, D.C: U.S. Dept. of the Interior, National Park Service, 1962.

MLA (9th ed.) Citation

Tilberg, Frederick. Gettysburg National Military Park, Pennsylvania. Rev. ed. U.S. Dept. of the Interior, National Park Service, 1962.