Gaya APA
Marshak, Stephen. (2001).
Earth : Portrait of a Planet .
London:
W.W Norton & Company.
Gaya Chicago
Marshak, Stephen.
Earth : Portrait of a Planet.
London:
W.W Norton & Company,
2001.
Text.
Gaya MLA
Marshak, Stephen.
Earth : Portrait of a Planet.
London:
W.W Norton & Company,
2001.
Text.
Gaya Turabian
Marshak, Stephen.
Earth : Portrait of a Planet.
London:
W.W Norton & Company,
2001.
Print.