Quinlan, David, author
Mandarin, 1994
Buku Referensi
Twiname, B. Gayle, author
Prentice-Hall, 2002
Buku Teks
Hibbison, Eric, author
Prentice-Hall, 1984
Buku Referensi
Cambrisge Havard University Press 1944
Buku Teks
Rosenwasser, David
Fort Worth Harcourt Brace College 1997,
Buku Referensi