American Enterprise Institute for Public Policy Research, 1977
Buku Teks
Sweet & Maxwell, 1984
Buku Teks
Hanselman, Duane
Prentice-Hall, 1997
Buku Teks
Hanselman, Duane
Prentice-Hall, 1998
Buku Teks SO
Hanselman, Duane
Prentice-Hall, 1998
Buku Teks SO