Hemphill, P. D., & McCormick, D. W. (1991). Business communications with writing improvement exercises (4th ed.). Regents/Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Hemphill, Phyllis Davis, agus Donald W. McCormick. Business Communications with Writing Improvement Exercises. 4th ed. Englewood Cliffs, NJ: Regents/Prentice-Hall, 1991.
Lua MLA (9ú heag.)Hemphill, Phyllis Davis, agus Donald W. McCormick. Business Communications with Writing Improvement Exercises. 4th ed. Regents/Prentice-Hall, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.