Hubbard, L. Ron, 1911-1986, author
Bridge Publications, Inc., 2012
Buku Referensi
Johnson, James Weldon, author
Viking , 1969
Buku Teks
Boylen, Margaret
Random House, 1961
Buku Teks
Golden, Harry, author
World Pub., 1961
Buku Teks
Morris, Mary E.S., author
Penguin Books, 1989
Buku Teks