Hitomi, Masuhara
Singapore University Press , 2000
Buku Teks
Leggitt, Jim
John Wiley & Sons, 2002.
Buku Teks
Brookes, Arthur
Cambridge University Press, 1990
Buku Teks
Cleveland, Ohio, Lincoln Extension Institute
Buku Teks
Yuni Reti Intarti, author
2007
UI - Tesis (Membership)