Gaya APA
Humphrey, C, R. (2002).
Environment, energy, and society: a new synthesis (1st ed.).
Belmont, CA.:
Wadsworth/Thomson Learning.
Gaya MLA
Humphrey, Craig, R..
"Environment, energy, and society: a new synthesis".
1st ed.
Belmont, CA.:
Wadsworth/Thomson Learning,
2002.
Text.