Cita APA (7th ed.)

Hemphill, P. D., & Hemphill, A. M. (1981). Business communications with writing improvement exercises (2nd ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Hemphill, Phyllis D., i Anita M. Hemphill. Business Communications with Writing Improvement Exercises. 2nd ed. Englewood Cliffs, N.J: Prentice-Hall, 1981.

Cita MLA (9th ed.)

Hemphill, Phyllis D., i Anita M. Hemphill. Business Communications with Writing Improvement Exercises. 2nd ed. Prentice-Hall, 1981.