Cita APA (7a ed.)

Zahn, D. (2004). Quintessential guide to using consultants. HRD Press.

Cita Chicago Style (17a ed.)

Zahn, David. Quintessential Guide to Using Consultants. Amherst, Mass.: HRD Press, 2004.

Cita MLA (8a ed.)

Zahn, David. Quintessential Guide to Using Consultants. HRD Press, 2004.