APA Style
Encyclopedia Americana Vol.20. (2001).
USA:
Grolier Incorporated.
Chicago Style
Encyclopedia Americana Vol.20.
International.
USA:
Grolier Incorporated,
2001.
Book.
MLA Style
Encyclopedia Americana Vol.20.
International.
USA:
Grolier Incorporated,
2001.
Book.
Turabian Style
Encyclopedia Americana Vol.20.
USA:
Grolier Incorporated,
2001.
Book.