APA (7th ed.) Citation

Sontag, W., Griffin, L., & Schullery, P. (1991). The National Park Service: A seventy-fifth anniversary album. Roberts Rinehart.

Chicago Style (17th ed.) Citation

Sontag, William, Linda Griffin, and Paul Schullery. The National Park Service: A Seventy-fifth Anniversary Album. Boulder, Colo.: Roberts Rinehart, 1991.

MLA (9th ed.) Citation

Sontag, William, et al. The National Park Service: A Seventy-fifth Anniversary Album. Roberts Rinehart, 1991.