Silalahi, Robert P., author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 1997
UI - Tesis (Membership)
The International City Manager's Association, 1950
Buku Teks
The International City Manager's Association, 1947
Buku Teks
Webster, Donald H., author
Harper & Row , 1958
Buku Teks
Crawford, Kenneth Grant
University of Toronto Press, 1958
Buku Teks