Clark, Gordon, author
Sage, 2003
Buku Teks
by Les Rowntree ... [and others]
Prentice-Hall, 2011
Buku Teks
Cole, J.P., author
Penguin Books, 1979
Buku Teks
Jackson, Richard H., author
Wiley, 1986
Buku Teks
Jackson, Richard H., author
John Wiley & Sons, 1982
Buku Teks