Great books of the western world; Vol. LI
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. XLI
edited by Mortimer J. Adler
Hi Willow Research and Publishing, 1990
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Great books of the western world; Vol. XLII
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
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Great books of the western world; Vol. XIII
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. XL
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi