Weimer, David L., author
Prentice-Hall, 1992
Buku Teks
Bozeman, Barry, author
St. Martin's Press, 1979
Buku Teks
by Peter Knoepfel ... [and others]
Policy Press, 2007
Buku Teks
Reynolds, Lloyd G., author
Richard D. Irwin, 1973
Buku Teks
Bach, George Leland, author
Prentice-Hall, 1980
Buku Teks