Mitton,Maureen
John Wiley, 1999
Buku Teks SO
Pile, John F.
H.N. Abrams, 1995
Buku Teks SO
Whiton, Sherrill
HarperCollins, 1974
Buku Teks SO
Mitton, Maureen
John Wiley & Sons, [Date of publication not identified]
Buku Teks SO
Massachusetts: Rockport Publishers,, 1997
Buku Teks SO