Mooney, Linda A.
Cengage Learning, 2017
Buku Teks SO
edited by Frank W. Schneider, Jamie A. Gruman, Larry M. Coutts
Sage , 2012
Buku Teks SO
Kornblum, William
Prentice-Hall, 1992
Buku Teks SO
Henslin, James M.
McGraw-Hill, 1983
Buku Teks
Palen, J. John
McGraw-Hill, 1979
Buku Teks