Great books of the western world
Adler, Mortimer J., editor in chief
Chicago, Encyclopedia Britanica, Inc, 1990, 1994
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Great books of the western world: 1 the great conversation
editor, Robert Maynard Hutchins
Encyclopaedia Britannica, 1952
 Buku Referensi
Great books of the western world, III
editor in chief, Mortimer J. Adler
Encyclopedia Britanica,
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Great books of the western world, LVI
Mortimer J. Adler, editor in chief
Encyclopedia Britanica, 1994
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Great books of the western world, XXIX
Mortimer J. Adler, editor in chief
Encyclopedia Britanica,
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