Fuente: The New Drawing on the Right Side of the Brain (1979), p.237
Betty Edwards: Frases en inglés
Fuente: The New Drawing on the Right Side of the Brain (1979), p.196
Fuente: The New Drawing on the Right Side of the Brain (1979), p.237
Fuente: The New Drawing on the Right Side of the Brain (1979), p.239
Fuente: The New Drawing on the Right Side of the Brain (1979), p.239
Fuente: The New Drawing on the Right Side of the Brain (1979), p.196