Wine, R. Lowell
Prentice Hall of India, 1966
Buku Teks
Ullman, Neil R., author
John Wiley & Sons, 1978
Buku Teks
Wonnacott, Thomas H., 1935-, author
John Wiley & Sons, 1990
Buku Teks
Mann, Prem S, author
Jon Wiley & Sons, 2011
Buku Teks
Godfrey, M.G., author
Edward Arnold , 1986
Buku Teks