Cita APA (7th ed.)

Russell, F. (1988). Selling principles and practices. McGraw-Hill.

Cita Chicago (17th ed.)

Russell, Frederic. Selling Principles and Practices. New York: McGraw-Hill, 1988.

Cita MLA (9th ed.)

Russell, Frederic. Selling Principles and Practices. McGraw-Hill, 1988.