Gaya APA
The World book encyclopedia U-V (Volume 20). (1978).
United state:
Scott and Fetzer company.
Gaya Chicago
The World book encyclopedia U-V (Volume 20).
.
United state:
Scott and Fetzer company,
1978.
Text.
Gaya MLA
The World book encyclopedia U-V (Volume 20).
.
United state:
Scott and Fetzer company,
1978.
Text.
Gaya Turabian
The World book encyclopedia U-V (Volume 20).
United state:
Scott and Fetzer company,
1978.
Print.