Kaiser, Edward John, author
University of Illinois Press, 1995
Buku Teks
Barkley, Bruce T., author
Nias Press, 2011
Buku Teks
Reiner, Laurence E., author
Prentice-Hall, 1972
Buku Referensi
Beatley, Timothy, author
University California Press, 2003
Buku Teks
Blackman, William C., author
CRC Lewis, 1996
Buku Teks