Gaya APA
Incorporated, G. (1996).
The Encyclopedia Americana Internasional Edition Volume 21 (Vol. 21).
United States Of America:
Grolier Incorporated.
Gaya MLA
Incorporated, Grolier.
"The Encyclopedia Americana Internasional Edition Volume 21".
Vol. 21
United States Of America:
Grolier Incorporated,
1996.
Text.