Gaya APA
Northcott, Richard. (2012).
Earth .
New York:
Oxford University Press.
Gaya Chicago
Northcott, Richard.
Earth.
New York:
Oxford University Press,
2012.
Text.
Gaya MLA
Northcott, Richard.
Earth.
New York:
Oxford University Press,
2012.
Text.
Gaya Turabian
Northcott, Richard.
Earth.
New York:
Oxford University Press,
2012.
Print.