American Psychological Association
University of Chicago ( 1981 ). New Encyclopaedia Britannica Macropaedia V.20 ( 00 ed. ). Encyclopaedia Britannica Ltd.
Modern Language Association
University of Chicago. New Encyclopaedia Britannica Macropaedia V.20 . Encyclopaedia Britannica Ltd. 1981
Chicago Citation
University of Chicago. New Encyclopaedia Britannica Macropaedia V.20 . 00 .London
: Encyclopaedia Britannica Ltd, 1981.
American Medical Association
University of Chicago. New Encyclopaedia Britannica Macropaedia V.20 . Encyclopaedia Britannica Ltd; 1981.
