Picard, A. (2013). Essential techniques for pastel portraits. Northlight Media F+W Media.
Cita Chicago (17th ed.)Picard, Alain. Essential Techniques for Pastel Portraits. [Cincinnati, Ohio]: Northlight Media F+W Media, 2013.
Cita MLA (9th ed.)Picard, Alain. Essential Techniques for Pastel Portraits. Northlight Media F+W Media, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.