Hammer, Nelson R., author
Rockport, 1999
Buku Teks
Allen, Phyllis Sloan, author
Prentice-Hall, 2000
Buku Referensi
Pile, John F., author
H.N. Abrams, 1995
Buku Teks
Whiton, Sherrill, author
HarperCollins, 1974
Buku Teks
Massachusetts: Rockport Publishers,, 1997
Buku Teks