APA (7th ed.) Citation

Rohrbourgh. (1998). Upgrade your own PC (2nd.ed.). An International Data Group.

Chicago Style (17th ed.) Citation

Rohrbourgh. Upgrade Your Own PC. 2nd.ed. New York: An International Data Group, 1998.

MLA (9th ed.) Citation

Rohrbourgh. Upgrade Your Own PC. 2nd.ed. An International Data Group, 1998.

Warning: These citations may not always be 100% accurate.