Gaya APA
David M. Helgren, dkk. (1985).
WORLD GEOGRAPHY TODAY Workbook .
New York:
Holt, Rinehart and Winston, Publishers.
Gaya Chicago
David M. Helgren, dkk.
WORLD GEOGRAPHY TODAY Workbook.
New York:
Holt, Rinehart and Winston, Publishers,
1985.
Text.
Gaya MLA
David M. Helgren, dkk.
WORLD GEOGRAPHY TODAY Workbook.
New York:
Holt, Rinehart and Winston, Publishers,
1985.
Text.
Gaya Turabian
David M. Helgren, dkk.
WORLD GEOGRAPHY TODAY Workbook.
New York:
Holt, Rinehart and Winston, Publishers,
1985.
Print.