Ralph Fasold; Jeff Connor-Linton
Cambridge University Press , 2006
Buku Teks
Fromkin, Victoria A.
Holt, Rinehart and Winston, 1981
Buku Teks
Holt, Rinehart and Winston, 1990
Buku Teks
Bloomfield, Leonard
Dewan Bahasa dan Pustaka, 1992
Buku Teks
Yule, George
Cambridge Cambridge University , 2006
Buku Teks