edited by John D. Edwards
Prentice-Hall, 1992
Buku Referensi
Bruton, Michael J., author
Hutchinson, 1975
Buku Teks
Papacostas, C. S., author
Pearson/Prentice Hall, 2005
Buku Teks
Adams, John, 1938-, author
Routledge & Kegan Paul, 1981
Buku Teks
Wright, Paul H., author
John Wiley & Sons, 1989
Buku Teks