Cita APA (7th ed.)

Hemphill, P. D., & McCormick, D. W. (1991). Business communications with writing improvement exercises (4th ed.). Prentice Hall.

Cita Chicago (17th ed.)

Hemphill, Phyllis Davis, i Donald W. McCormick. Business Communications with Writing Improvement Exercises. 4th ed. Englewood Cliffs, N.J: Prentice Hall, 1991.

Cita MLA (9th ed.)

Hemphill, Phyllis Davis, i Donald W. McCormick. Business Communications with Writing Improvement Exercises. 4th ed. Prentice Hall, 1991.