Leavitt, Harold J.
Managerial psychology: an introduction to individuals, pairs, and groups in organizations
University of Chicago Press, 1958
 Buku Teks
Consultants and consulting organizations directory : a reference guide to concerns and individuals engaged in consultation for business, industry, and government
edited by Janice McLean
Gale Research, 1991
 Buku Referensi
Shulman, Lawrence
The skills of helping individuals, families, groups, and communities
Brooks/Cole Cengage Learning, 2012
 Buku Teks
Machi, Antonio
Groups : an introduction to ideas and methods of the theory of groups
Springer, 2012
 eBooks
O`Hara, Agi
Skills for human service practice : working with individuals, groups and communities
Oxford University Press, 2014
 Buku Teks