Gaya APA
Environmental geology. (2006).
New York:
[s.n.].
Gaya Chicago
Environmental geology.
Ed. 7.
New York:
[s.n.],
2006.
Text.
Gaya MLA
Environmental geology.
Ed. 7.
New York:
[s.n.],
2006.
Text.
Gaya Turabian
Environmental geology.
New York:
[s.n.],
2006.
Print.