Iman Sudiyat, author
Liberty, 2007
Buku Teks
Siburian, Lawrence Tp, author
Universitas Indonesia, 1983
UI - Skripsi (Membership)
Simorangkir, J.C.T., author
Gunung Agung, 1984
Buku Teks
Marpaung, Lintje Anna, author
Andi, 2018
Buku Teks
Sudarsono, author
Rineka Cipta, 1991
Buku Teks