Gaya APA
The World Book Encyclopedia (U-V Volume 20). (1972).
USA:
Field Enterprises Educational Corporation.
Gaya Chicago
The World Book Encyclopedia (U-V Volume 20).
U-V Volume 20, 1972.
USA:
Field Enterprises Educational Corporation,
1972.
Text.
Gaya MLA
The World Book Encyclopedia (U-V Volume 20).
U-V Volume 20, 1972.
USA:
Field Enterprises Educational Corporation,
1972.
Text.
Gaya Turabian
The World Book Encyclopedia (U-V Volume 20).
USA:
Field Enterprises Educational Corporation,
1972.
Print.