Hemphill, P. D. (1986). Business communications with writing improvement exercises (3d ed.). Prentice-Hall.
Chicago Style aipamenaHemphill, Phyllis Davis. Business Communications with Writing Improvement Exercises. 3d ed. New Jersey: Prentice-Hall, 1986.
MLA aipamenaHemphill, Phyllis Davis. Business Communications with Writing Improvement Exercises. 3d ed. Prentice-Hall, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.