Universitas Indonesia, 1992
UI - Skripsi Membership
Marpaung, Leden, author
Djambatan, 2003
Buku Teks
Marpaung, Leden, author
Djambatan, 2005
Buku Teks
Universitas Indonesia, 1997
UI - Skripsi Membership
Eriyantouw Wahid, author
2001
UI - Disertasi Membership