Cita APA (7a ed.)

Beckman, T. N., & Held, F. E. (1925). Collection correspondence and agency practice. McGraw-Hill.

Cita Chicago Style (17a ed.)

Beckman, Theodore N., y Felix E. Held. Collection Correspondence and Agency Practice. New York [etc.]: McGraw-Hill, 1925.

Cita MLA (9a ed.)

Beckman, Theodore N., y Felix E. Held. Collection Correspondence and Agency Practice. McGraw-Hill, 1925.