Hlavács, George The exceptionally simple theory of sketching: why do professional sketches look beautiful? George Hlavács - Amsterdam : BIS Publishers, 2014 - 35 p. il. col 21 cm + 14 láminas ISBN: 9789063693343 LCCN: 000005099 Subjects--Topical Terms: Dibujo--TécnicaDiseño--Técnica