Gaya APA
Botkin, Daniel B,, Keller, Edward A. (1982).
ENVIRONMENTAL STUDIES ; The Earth as a Living Planet .
Ohio:
Bell & Howell.
Gaya Chicago
Botkin, Daniel B,, Keller, Edward A.
ENVIRONMENTAL STUDIES ; The Earth as a Living Planet.
Ohio:
Bell & Howell,
1982.
Text.
Gaya MLA
Botkin, Daniel B,, Keller, Edward A.
ENVIRONMENTAL STUDIES ; The Earth as a Living Planet.
Ohio:
Bell & Howell,
1982.
Text.
Gaya Turabian
Botkin, Daniel B,, Keller, Edward A.
ENVIRONMENTAL STUDIES ; The Earth as a Living Planet.
Ohio:
Bell & Howell,
1982.
Print.