Gaya APA
World Regional Geography. (1967).
new jersey:
Prentice Hall.
Gaya Chicago
World Regional Geography.
Ed.3, Cet.2.
new jersey:
Prentice Hall,
1967.
.
Gaya MLA
World Regional Geography.
Ed.3, Cet.2.
new jersey:
Prentice Hall,
1967.
.
Gaya Turabian
World Regional Geography.
new jersey:
Prentice Hall,
1967.
.