Gaya APA
Essentials of Geology. (2004).
New York:
[s.n.].
Gaya Chicago
Essentials of Geology.
.
New York:
[s.n.],
2004.
Text.
Gaya MLA
Essentials of Geology.
.
New York:
[s.n.],
2004.
Text.
Gaya Turabian
Essentials of Geology.
New York:
[s.n.],
2004.
Print.