Robert M. Hutchins, Mortimer J. Adler, editors in chief
Encyclopaedia Britannica, Inc., 1963
Buku Referensi
Campbell, Oscar James, author
Crofts, 1947
Buku Teks
Mortimer J. Adler, editor in chief
Encyclopedia Britanica, 1994
Buku Referensi
Weitzman, David, author
Charles Seribner's Sond, 1994
Buku Referensi
Poe, Edgar Allan, author
Washington Square Press, Inc., [date of publication not identified]
Buku Teks