Waugh, Anne, author
Churchill Livingstone , 2006
Buku Teks
Shier, David, author
McGraw-Hill, 2004
Buku Teks
Tortora, Gerard J., author
John Wiley & Sons, 2011
Buku Teks
Patton, Kevin T.
Elsevier, 2010
Buku Referensi
Patton, Kevin T., author
Elsevier, 2012
Buku Teks