Gaya APA
Cunningham, W, P. (2006).
PRINCIPLES OF : Environmental Science INQUIRY AND APPLICATION (Third Edition).
Hoboken, NJ:
McGraw Hill Education.
Gaya MLA
Cunningham, William, P.
"PRINCIPLES OF : Environmental Science INQUIRY AND APPLICATION".
Third Edition
Hoboken, NJ:
McGraw Hill Education,
2006.
Text.