Schusky, Ernest l.
Holt Rinehart and Winston, 1975
Buku Teks
Stacey, Jackie
Routledge, 1997
Buku Teks
Tan, Giok-Lan, author
Cornell University, 1963
Buku Teks
Gulick, Sidney Lewis, author
Charles E. Tuttle, 1962
Buku Teks
Rigby, Brian, author
Routledge , 1991
Buku Teks