Great books of the western world; Vol. X
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. V
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. XIV
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. XVII
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi
Great books of the western world; Vol. XX
edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
 Buku Referensi