Doering, Mildred
Sage Publications, 1983
Buku Teks
edited by John Field, Ronald J. Burke and Cary L. Cooper.
SAGE, 2013
Buku Referensi
Abraham Hantang Jet Jamaran, author
Universitas Indonesia, 2015
UI - Tesis Membership
edited by Clark Tibbitts and Wilma Donahue
Prentice-Hall, 1960
Buku Teks
Schulz, James H., author
Wadsworth, 1985
Buku Teks