APA (7th ed.) Citation

United States. Office of Education, Capen, S. P., & Zook, G. F. (1921). Opportunities for study at American graduate schools. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Office of Education, Samuel Paul Capen, and George Frederick Zook. Opportunities for Study at American Graduate Schools. Washington: U.S. GPO, 1921.

MLA (9th ed.) Citation

United States. Office of Education, et al. Opportunities for Study at American Graduate Schools. U.S. GPO, 1921.