Kolvenbach, Jur Walter
Kluwer Deventer, 1979
Buku Teks
Kolvenbach, Walter
Kluwer, 1979
Buku Teks
Withington, Frederic G.
John Wiley & Sons, 1972
Buku Teks
Precisian, Magneta Nan, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Skripsi (Open)
Sauer, Elisa Swisher, author
Lippincott Williams & Wilkin , 2003
Buku Teks