Mays, Larry W.
McGraw-Hill, 1992
Buku Teks
Martin lambert, Michael Leonard, Andrew Metcalfe
Taylor and Francis, 2009
Buku Teks
Shearer, J. Lowen, author
Prentice-Hall, 1997
Buku Teks
Basmadjian, Diran, author
Chapman & Hall/CRC , 2007
Buku Teks
Carmichael, D.G., author
Ellis Horwood, 1981
Buku Teks