Gerstman, B. Burt
Massachusetts Jones & Bartlett Learning, 2015
Buku Teks
Freeman, Ruth B.
W.B. Saunders, 1969
Buku Teks SO
Friis, Robert H.
Jones and Bartlett, 2014
Buku Teks SO
Steven M. Teutsch, R. Elliot Churchill
Oxford University Press, 2000
Buku Teks SO
edited by Cathy E. Lloyd ... [and others]
Sage, 2007
Buku Teks SO