Bainbridge, David I.
Pitman , 1993
Buku Teks
Bainbridge, David I.
Pitman, 1993
Buku Teks
Bigelow, Robert P.
Upper Saddle River, NJ: Prentice Hall, 1975,
Buku Referensi
Gemignani, Michael C.
CBI Publishing , 1981
Buku Teks
Bainbridge, David I.
Sinar Grafika, 1993
Buku Teks SO