edited by Richard K. Riegelman, Gail J. Povar
Brown and comp, 1988
Buku Teks
Bodurtha, Frank T., author
McGraw-Hill, 1980
Buku Teks
Sage Publications, 1987
Buku Teks
Jones, Denny A., author
Prentice-Hall, 1996
Buku Teks
Lundman, Richard J., author
Oxford University Press, 1993
Buku Teks