Cita APA (7th ed.)

Hawkins, N. A. (1920). The selling process (7th ed.). N.A. Hawkins.

Cita Chicago (17th ed.)

Hawkins, Norval Abiel. The Selling Process. 7th ed. Detroit, Mich: N.A. Hawkins, 1920.

Cita MLA (9th ed.)

Hawkins, Norval Abiel. The Selling Process. 7th ed. N.A. Hawkins, 1920.