Gaya APA
Marshak, S.
(2012).
Earth Portrait of a Planet (4e)
(
4 edd)
.
New York/London:
W.W. Norton & Company.
Gaya MLA
Marshak, Stephen.
"Earth Portrait of a Planet (4e)".
4 edd
New York/London:
W.W. Norton & Company,
2012.
Text.