Freeman, Robert J., author
Prentice-Hall, 1988
Buku Teks
Freeman, Robert J., author
Prentice-Hall, 1993
Buku Teks
Freeman, Robert J., author
Prentice-Hall, 1999
Buku Teks
Freeman, Robert J., author
Prentice-Hall, 2003
Buku Teks
Wilson, Earl R., author
McGraw-Hill Book , 1999
Buku Teks