Kumar, Ann, author
The Lontar Foundation , 1996
Buku Referensi
Pojman, Louis P., author
Thomson Wadsworth, 2006
Buku Teks
Albert, Ethel M., author
American Book Company, 1953
Buku Teks
Barfield, Jesse T., author
South-Western College Publishing, 1998
Buku Teks
Billett, Stephen, author
Springer, 2011
Buku Teks