APA Style
Britannica, . (1981).
The New Encyclopedia Britannica; Macropedia(Knowdege in Depth) Vol 1-19 .
U.S.A:
Encyclopedia Britannica Inc.
MLA Style
Britannica, .
"The New Encyclopedia Britannica; Macropedia(Knowdege in Depth) Vol 1-19".
U.S.A:
Encyclopedia Britannica Inc,
1981.
Art Original.