Huala, Adolf, author
RajaGrafindo Persada, 1994
Buku Teks
Huala, Adolf, author
Rajawali, 1993
Buku Teks
Sudargo Gautama, author
Alumni, 1992
Buku Teks
Silaban, Rionald, author
Universitas Indonesia, 1989
UI - Skripsi (Membership)
Sudargo Gautama, author
Eresco, 1989
Buku Teks