Lua APA (7ú heag.)
Guffey, M. E., & Loewy, D. (2010). Essentials of business communication (8th ed.). South-Western Cengage Learning.
Lua i Stíl Chicago (17ú heag.)
Guffey, Mary Ellen, agus Dana Loewy. Essentials of Business Communication. 8th ed. Mason, OH: South-Western Cengage Learning, 2010.
Lua MLA (9ú heag.)
Guffey, Mary Ellen, agus Dana Loewy. Essentials of Business Communication. 8th ed. South-Western Cengage Learning, 2010.
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