Kavanagh, Barry F.
Prentice-Hall, 1996
Buku Teks
Crow, D.R.
Chapman and Hall, 1988
Buku Teks
Rittman, Bruce E.
McGrow-Hill , 2001
Buku Teks
Hall, Robert Ernest
South-Western College Publishing , 1998
Buku Teks
Fowler, Richard J.
McGraw-Hill , 2003
Buku Teks