Shuter, Paul
Heineman Educational , 1988
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1961
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1966
Buku Teks
Keylor, William R., 1944-, author
Oxford University Press, 1996
Buku Teks
Teed, Peter, author
Oxford University Press , 1992
Buku Referensi