Hasegawa, Noriyoshi, author
Page one publishing pte ltd, 2010
Buku Teks
Suwardi Luis, author
Gramedia Pustaka Utama, 2010
Buku Teks
Chang, Valeri, author
Cengage Learning, 2013
Buku Teks
Porter, Lindsay, author
Porter Publishing, 1995
Buku Referensi
Kumar, Ranjit, author
Sage , 2014
Buku Teks