Mooney, Linda A.
Wadsworth, Thomson Learning, 2000
Buku Teks
edited by Frank W. Schneider, Jamie A. Gruman, Larry M. Coutts
Sage , 2012
Buku Teks
Henslin, James M.
McGraw-Hill, 1983
Buku Teks
Palen, J. John
McGraw-Hill, 1979
Buku Teks
Scarpitti, Frank R.
Holt, Rinehart and Winston, 1974
Buku Teks