Cita APA (7a ed.)

Haas, K. B., & Ernest, J. W. (1978). Principles of creative selling. Glencoe Pub.

Cita Chicago Style (17a ed.)

Haas, Kenneth Brooks, y John W. Ernest. Principles of Creative Selling. Encino Calif: Glencoe Pub, 1978.

Cita MLA (9a ed.)

Haas, Kenneth Brooks, y John W. Ernest. Principles of Creative Selling. Glencoe Pub, 1978.