Gaya APA
The Encyclopedia Americana, volume 21. (1975).
:
Americana Corporation.
Gaya Chicago
The Encyclopedia Americana, volume 21.
.
:
Americana Corporation,
1975.
Art Original.
Gaya MLA
The Encyclopedia Americana, volume 21.
.
:
Americana Corporation,
1975.
Art Original.
Gaya Turabian
The Encyclopedia Americana, volume 21.
:
Americana Corporation,
1975.
Art Original.