APA (7th ed.) Citation

Center of Military History, Sullivan, G. R., & Gjernes, M. (1991). Portrait of an army. Center of Military History, United States Army.

Chicago Style (17th ed.) Citation

Center of Military History, Gordon R. Sullivan, and Marylou Gjernes. Portrait of an Army. Washington, D.C.: Center of Military History, United States Army, 1991.

MLA (9th ed.) Citation

Center of Military History, et al. Portrait of an Army. Center of Military History, United States Army, 1991.