APA Style

Guffey, M, E., Loewy, D. (2015). Business communication : process and product. Eighth Edition (Eighth Edition). Stamford: Cengage Learning.

MLA Style

Guffey, Mary, Ellen., Loewy, Dana. "Business communication : process and product. Eighth Edition". Eighth Edition Stamford: Cengage Learning, 2015. Text.