Herriott, Luke
Rockport publishers, Inc., 2009
Buku Referensi
Heller, Steven, auhtor
Rockport publishers, 2011
Buku Teks
Adi Kusrianto, author
Elex Media Komputindo, 2009
Buku Teks
Basheer , 2007
Buku Referensi
Laurel Saville, Steve Gordhan, Jodhua Berger, Sarch Dougher, editor
Page one publishing pte ltd, 2011
Buku Referensi