Grayson, George W., author
Thomson, 2004
Buku Teks
Rose, John David, author
Authorhouse, 2005
Buku Teks
Camilleri, Joseph, author
Routledge, 2013
Buku Teks
Syamsul Ma`arif, author
Logung Pustaka, 2005
Buku Teks
Panjaitan, Halasan, author
STT Gratia, 2013
Buku Teks