Shera, Jesse H.
Archon Books, 1965
Buku Referensi
Rungkat, Thelma
ANCORA Press , 1997
Buku Teks SO
University od Chicago Press, 1965
Buku Teks SO
editor, E. Dale Cluff
Haworth Press, 1990
Buku Teks SO
edited by Loriene Roy, Kelly Jensen, Alex Hershey Meyers
[American Management Association, ], 2009
eBooks