Gaya APA
Gorr. (2005).
GIS Tutorial .
UNITED STATES OF AMERICA:
Library of Congres.
Gaya Chicago
Gorr.
GIS Tutorial.
UNITED STATES OF AMERICA:
Library of Congres,
2005.
Text.
Gaya MLA
Gorr.
GIS Tutorial.
UNITED STATES OF AMERICA:
Library of Congres,
2005.
Text.
Gaya Turabian
Gorr.
GIS Tutorial.
UNITED STATES OF AMERICA:
Library of Congres,
2005.
Print.