Gaya APA
Encyclopedia Americana vol. 4. (1980).
USA:
Americana Corporation.
Gaya Chicago
Encyclopedia Americana vol. 4.
.
USA:
Americana Corporation,
1980.
Text.
Gaya MLA
Encyclopedia Americana vol. 4.
.
USA:
Americana Corporation,
1980.
Text.
Gaya Turabian
Encyclopedia Americana vol. 4.
USA:
Americana Corporation,
1980.
Print.