Gaya APA
Marskhak, S.
(2012).
Earth : Portit of a Planet
(
Cet. 1)
.
New York:
W. W. Norton & Company.
Gaya MLA
Marskhak, Stephen.
"Earth : Portit of a Planet".
Cet. 1
New York:
W. W. Norton & Company,
2012.
Text.