Gaya APA

Smith, R, E. (2007). Electricity : For Refrigeration , Heating And Air Condioning 7th Edition (7). New York: Delmar Cengage Learning.

Gaya MLA

Smith, Russel, E.. "Electricity : For Refrigeration , Heating And Air Condioning 7th Edition". 7 New York: Delmar Cengage Learning, 2007. Text.