Brownie, Barbara, author
Artpower, 2009
Buku Referensi
Drate, Spencer, author
North Light Books, 1999
Buku Referensi
Donnelly, Daniel, author
Page One Publishing, 2011
Buku Referensi
Rockport publishers, Inc., 2008
Buku Referensi
Page One, 2011
Buku Referensi