Coughlan, Robert, author
Time Incorporated, 1962
Buku Teks
Eristya Puspitadewi Irwanto, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis (Membership)
BPP Teknologi, 1995
Buku Teks
Sandoz, Mari
University of Nesbraska Press, 1958
Buku Teks
Silverman, Mark P., author
Cambridge University Press , 1993
Buku Teks