APA (7th ed.) Citation

Marley, D., & Parker, C. S.. (2009). Understanding computers: Today and tomorrow (12th ed.). Cengage Learning.

Chicago Style (17th ed.) Citation

Marley, Deborah, and Charles S. Parker. Understanding Computers: Today and Tomorrow. 12th ed. Boston: Cengage Learning, 2009.

MLA (9th ed.) Citation

Marley, Deborah, and Charles S. Parker. Understanding Computers: Today and Tomorrow. 12th ed. Cengage Learning, 2009.