Great books of the western world
Adler, Mortimer J., editor in chief
Chicago, Encyclopedia Britanica, Inc, 1990, 1994
 Buku Referensi
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, XLVII
Mortimer J. Adler, editor in chief
Encyclopedia Britanica, 1995
 Buku Referensi
Great books of the western world, XLV
Mortimer J. Adler, editor in chief
Encyclopedia Britanica, 1995
 Buku Referensi
Great books of the western world, VII
Mortimer J. Adler, editor in chief
Encyclopedia Britanica, 1996
 Buku Referensi