Gaya APA
Introduction to Geographic Information Systems. (2006).
New York:
[s.n.].
Gaya Chicago
Introduction to Geographic Information Systems.
.
New York:
[s.n.],
2006.
Text.
Gaya MLA
Introduction to Geographic Information Systems.
.
New York:
[s.n.],
2006.
Text.
Gaya Turabian
Introduction to Geographic Information Systems.
New York:
[s.n.],
2006.
Print.