Stephan, Paul B.
Charlottesville, 1996
Buku Teks
Hotchkiss, Carolyn
McGrawhill, 1994
Buku Teks
Folsom, Ralph Haughwout, author
West Group, 1996
Buku Teks
Folsom, Ralph Haughwout, author
West Publishing, 1992
Buku Teks
Raworth, Philip
Thomson Professional Publishing, 1991
Buku Teks