Sipahutar, Nixon Dermawan Hasahatan, author
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Universitas Indonesia, 1993
UI - Skripsi (Membership)
The Overseas Economic Cooperation Fund, 1994
Buku Teks
Muhamad Djumhana, author
Citra Aditya Bakti, 1999
Buku Teks
Rachmadi Usman, author
Citra Aditya Bakti, 2002
Buku Teks