Cita APA (7a ed.)

Frederick, J. G. (1920). Modern sales management: A practical handbook and guide. D. Appleton.

Cita Chicago Style (17a ed.)

Frederick, J. George. Modern Sales Management: A Practical Handbook and Guide. New York [etc.]: D. Appleton, 1920.

Cita MLA (9a ed.)

Frederick, J. George. Modern Sales Management: A Practical Handbook and Guide. D. Appleton, 1920.