Gaya APA
The World book encyclopedia W-X-Y-Z (Volume 21). (1978).
:
World Book Childcraft International.
Gaya Chicago
The World book encyclopedia W-X-Y-Z (Volume 21).
.
:
World Book Childcraft International,
1978.
Text.
Gaya MLA
The World book encyclopedia W-X-Y-Z (Volume 21).
.
:
World Book Childcraft International,
1978.
Text.
Gaya Turabian
The World book encyclopedia W-X-Y-Z (Volume 21).
:
World Book Childcraft International,
1978.
Print.