Goh, Phai Cheng
Educational Publications Bureau, 1970
Buku Teks
Wheeler, James O.
John Wiley & Sons, 1986
Buku Teks
Alexander, John W.
Prentice-Hall, 1979
Buku Teks
Hartshorn, Truman Asa
Prentice-Hall, 1988
Buku Teks
Thatcher, W.S.
English University Press, 1957
Buku Teks