Gaya APA
Edward E, Keller. (2000).
Environmental Geology (8).
USA:
Prentice-Hall.
Gaya Chicago
Edward E, Keller.
Environmental Geology.
8
USA:
Prentice-Hall,
2000.
Text.
Gaya MLA
Edward E, Keller.
Environmental Geology.
8
USA:
Prentice-Hall,
2000.
Text.
Gaya Turabian
Edward E, Keller.
Environmental Geology.
8
USA:
Prentice-Hall,
2000.
Print.