Gates, Bill, author
John Wiley, 1998
Buku Teks
Smith, Daniel, author
Michael O'Mara Books Limited, 2015
Buku Teks
Sobel, Robert, author
Weybright and Talley, 1974
Buku Teks
Lewis, Miehael
Penguin Books , 1999
Buku Teks
Foley, Mary Jo, author
John Wiley & Sons, 2008
Buku Teks