Artikel Jurnal
Radjagukguk, Erman, author
UI-Press, 1997
UI - Pidato
Book, Sven Ake, author
Koperasi Jasa Audit Nasional , 1994
Buku Teks
Gaspersz, Vincent, author
Gramedia Pustaka Utama, 1997
Buku Teks
Gaspersz, Vincent, author
Gramedia Pustaka Utama, 1997
Buku Teks