Heijden, Kees van der, author
John Wiley & Sons, 1996
Buku Teks
Boulton, William R., author
Macmillan, 1984
Buku Teks
Morrisey, George L., author
Pearson Education Asia, 2002
Buku Teks
O`Hair, Dan, author
Kencana, 2009
Buku Teks
Martel, Myles
Dow Jones-Irwin, 1989
Buku Teks