Gibson, William, author
Bantam Books, 1962
Buku Teks
Laird, Charlton Grant, 1901-
A Fawcett Premier Book, 1966
Buku Teks
Laird, Charlton Grant, 1901-
Fawcett World Library, 1957
Buku Teks
Artikel Jurnal
Fife, Bruce, author
Penguin Books, 2004
Buku Teks