Ancheta, Angelo N.
Rutgers University Press, 1998
Buku Teks
Jaret, Charles
Harper Collins College Publishers, 1995
Buku Teks
Rose, Peter I., foreword
Random House, 1964
Buku Teks
CQ Press, 2002
Buku Teks
MacNair, Harley Farnsworth
D.van Nostrand Company,Inc., 1955
Buku Teks