Smith, George Horsley, author
McGraw-Hill, 1954
Buku Teks
Haryani Primanti, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2018
UI - Tesis (Membership)
Office of Instructiomnal Development University of Maryland University College, 1992
Buku Teks
Fennis, Bob M., author
Psychology Press, 2010
Buku Teks
Muhammad Gibraltar, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Tesis (Open)