Tonal values : how to see them, how to paint them

by Gair, Angela, 1954-
Published 1987

Drawing : a complete step-by-step guide to techniques and materials

by Gair, Angela, 1954-
Published 1994

Light : how to see it, how to paint it

by Willis, Lucy.
Published 1991

Artist's manual : a complete guide to painting and drawing materials and techniques

Published 1996