Nathanael Iskandar, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1970
UI - Disertasi (Membership)
Otero, George G., author
University of Denver, 1981
Buku Teks
Artikel Jurnal
Petersen, William, author
Macmillan, 1961
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks