Jakarta: PT. Multi Utama Consultindo,2000,
Buku Referensi
Ministry of Finance, 1996
Buku Teks
Richardson, Margaret Milner, author
John Wiley & Sons, 2000
Buku Teks
LM Patra, [date of publication not identified]
Buku Teks
[publisher not identified], 1968
Buku Teks