by Rebecca M. Saunders
Gemini Books, 2000
Buku Referensi
by Jeff Olsonby
Gemini Books, 2000
Buku Referensi
by Joseph T. Straub
Gemini Books, 2000
Buku Referensi
May, John
McGraw-Hill , 1983
Buku Teks
Banks, Erik, author
John Wiley & Sons, 2003
Buku Teks