editor-in-chief, Larry W. Mays
McGraw-Hill, 2000
Buku Referensi
Wagner, Edmund G.
Spon Press, 2001
Buku Teks
compiled by Michael and Irene Ash
Gower, 1996
Buku Referensi
Montgomery, James M.
John Wiley & Sons, 1985
Buku Teks
Mc Graw Hill, 1996
Buku Teks