Cita APA (7a ed.)

Gardner, W. E., Beery, R. W., & Olson, J. R. (1973). Selected case studies in American history. Allyn and Bacon.

Cita Chicago Style (17a ed.)

Gardner, William E., Robert W. Beery, y James R. Olson. Selected Case Studies in American History. Boston [etc.]: Allyn and Bacon, 1973.

Cita MLA (9a ed.)

Gardner, William E., et al. Selected Case Studies in American History. Allyn and Bacon, 1973.