Raworth, Philip
Thomson Professional Publishing, 1991
Buku Teks
Buku Teks
Willes, John H., author
McGraw-Hill, 2005
Buku Teks
edited and compiled by Mark Halloran
Prentice-Hall, 1991
Buku Teks
Jasion, Jan T., author
Ashgate Publishing Limited, 1991
Buku Referensi