Cita APA (7th ed.)

Westerman, M. D. (1993). The business environmental handbook. The Oasis Press/PSI Research.

Cita Chicago (17th ed.)

Westerman, Martin D. The Business Environmental Handbook. Grants Pass, Oregon: The Oasis Press/PSI Research, 1993.

Cita MLA (9th ed.)

Westerman, Martin D. The Business Environmental Handbook. The Oasis Press/PSI Research, 1993.