American Psychological Association
University of Chicago ( 1981 ). New Encyclopaedia Britannica Macropaedia V.18 ( 00 ed. ). Encyclopaedia Britannica Inc.
Modern Language Association
University of Chicago. New Encyclopaedia Britannica Macropaedia V.18 . Encyclopaedia Britannica Inc. 1981
Chicago Citation
University of Chicago. New Encyclopaedia Britannica Macropaedia V.18 . 00 .Chicago
: Encyclopaedia Britannica Inc, 1981.
American Medical Association
University of Chicago. New Encyclopaedia Britannica Macropaedia V.18 . Encyclopaedia Britannica Inc; 1981.
