Robert M. Hutchins, Mortimer J. Adler, editors in chief
Encyclopaedia Britannica, Inc., 1963
Buku Referensi
Robert M. Hutchins, Mortimer J. Adler, editors in chief
Encyclopaedia Britannica, Inc., 1963
Buku Referensi
Wilson, Edmund, 1895-1972
Penguin Books, 1993
Buku Teks SO
Williams, Harold Herbert
Sidgwick & Jackson, 1918
Buku Teks SO
Wilson, Edmund, 1895-1972
Charles Scribner's Sons, 1953
Koleksi Publik