Basheer , 2007
Buku Referensi
Donnelly, Daniel, author
Page One Publishing, 2011
Buku Referensi
Crowe, Mary, author
MacIntyre Purcell Pub, 2010
Buku Teks
Adi Kusrianto, author
Elex Media Komputindo, 2009
Buku Teks
Laurel Saville, Steve Gordhan, Jodhua Berger, Sarch Dougher, editor
Page one publishing pte ltd, 2011
Buku Referensi