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
 Buku Referensi
Great books of the western world; Vol. XLII
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. IX
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. LVI
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi