Gaya APA
World Geography. (1984).
Ohio:
Merrill Publishing.
Gaya Chicago
World Geography.
.
Ohio:
Merrill Publishing,
1984.
.
Gaya MLA
World Geography.
.
Ohio:
Merrill Publishing,
1984.
.
Gaya Turabian
World Geography.
Ohio:
Merrill Publishing,
1984.
.