Siregar, Zofrullah
Universitas Indonesia, 1992
UI - Skripsi Membership
Julianti Tri Astuti
1989
UI - Skripsi Membership
Universitas Indonesia, 1992
UI - Skripsi Membership
Universitas Indonesia, 1991
UI - Skripsi Membership
Universitas Indonesia, 2006
UI - Skripsi Membership