APA引文

United States. National Park Service, Yard, R. S., & Story, I. F. (1931). The national parks portfolio (6th ed.). U.S. Govt. Print. Off..

Chicago Style (17th ed.) Citation

United States. National Park Service, Robert Sterling Yard, and Isabelle F. Story. The National Parks Portfolio. 6th ed. Washington: U.S. Govt. Print. Off., 1931.

MLA引文

United States. National Park Service, et al. The National Parks Portfolio. 6th ed. U.S. Govt. Print. Off., 1931.

警告：這些引文格式不一定是100％准確.