Hirst, D.M., author
Macmillan, 1976
Buku Teks
Gormally, John, author
Prentice-Hall, 2000
Buku Teks
Armstrong, James W., author
Macmillan, 1976
Buku Teks
Campbell, Hugh G., author
Macmillan, 1974
Buku Teks
Rothenberg, Ronald I., author
John Wiley & Sons, 1980
Buku Teks