Cita APA (7a ed.)

Gopel, R. A. (1955). Managing salesmen. Printers' Ink Books.

Cita Chicago Style (17a ed.)

Gopel, Robert A. Managing Salesmen. Pleasantville, New York: Printers' Ink Books, 1955.

Cita MLA (9a ed.)

Gopel, Robert A. Managing Salesmen. Printers' Ink Books, 1955.