Harper, Laurel, author
Chronicle Books, 1999
Buku Referensi
Eskilson, Stephen, author
Laurence King , 2012
Buku Teks
Marcus, Goerge H.
Prestel, 1995
Buku Teks
Dean, Corinna
Rockport Publishers, 2000.
Buku Teks
Ramsey
John Wiley & Sons, 1994
Buku Referensi