Clough, Richard Hudson, author
John Wiley & Sons, Inc, 1994
Buku Teks
Cooke, Brian, author
Wiley-Blackwell, 2011
Buku Teks
Tanner, Ogden., author
Time-Life Books, 1978.
Buku Referensi
Eyres, David John, author
Butterworth-Heinemann, 2012
Buku Teks
Sauter, David, author
Delmar/Cengage Learning, 2011
Buku Teks