APA Style
Encyclopedia Americana (Volume 21). (1998).
Mexico city:
Grolier Incorporated.
Chicago Style
Encyclopedia Americana (Volume 21).
.
Mexico city:
Grolier Incorporated,
1998.
Buku.
MLA Style
Encyclopedia Americana (Volume 21).
.
Mexico city:
Grolier Incorporated,
1998.
Buku.
Turabian Style
Encyclopedia Americana (Volume 21).
Mexico city:
Grolier Incorporated,
1998.
Buku.