Gaya APA
Herman, S, L., Sparkman, B, L. (2006).
Electricity & Controls for HVAC/R 6 th Edition .
USA:
Delmar Cengage Learning.
Gaya MLA
Herman, Stephen, L.., Sparkman, Bennie, L..
"Electricity & Controls for HVAC/R 6 th Edition".
USA:
Delmar Cengage Learning,
2006.
Text.