Rucker, Bryce W.
The Iowa State Univ. Press, 1964
Buku Teks
translated by Koh Chang-soo
Hollym International, 1984
Buku Teks
Walker, Warens S.
Shoe String Press, 1984
Buku Referensi
edited by Holly Koelling
American Library association, 2007
eBooks
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
Buku Teks