Crittenden, John C., author
John Wiley & Sons, 2012
Buku Teks
Montgomery, James M., author
John Wiley & Sons, 1985
Buku Teks
Stephen J. Randtke, Michael B. Horsley, editor
McGraw-Hill, 2012
Buku Teks
Rees, Yvonne, author
Hingkong : Page One Pgublishing, 2002,
Buku Referensi
Rees, Yvonne, author
Page One Publishing, 2001
Buku Referensi