Press, Frank, author
W H Freeman , 1974
Buku Teks
Ward, Dederick C.
Scarecrow Press, 1981
Buku Referensi
Tarbuck, Edward J., author
Maxwell Macmillan, 1993
Buku Teks
McGeary, David, author
McGraw-Hill, 2004
Buku Referensi
Carlson, Diane H., author
McGraw-Hill , 2008
Buku Teks