Cox, Steven M., author
McGraw-Hill, 1998
Buku Teks
Blanchard, Robert E., author
John Wiley & Sons, 1975
Buku Teks
Ferguson, John Alexander, author
National Library of Australia, 1975
Buku Referensi
Ferguson, John Alexander, author
National Library of Australia, 1977
Buku Referensi
Ferguson, John Alexander, author
National Library of Australia, 1977
Buku Referensi