Lewis, D. (1983). Watercolor painting techniques. Watson-Guptill Publications.
Lua i Stíl Chicago (17ú heag.)Lewis, David. Watercolor Painting Techniques. New York: Watson-Guptill Publications, 1983.
Lua MLA (9ú heag.)Lewis, David. Watercolor Painting Techniques. Watson-Guptill Publications, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.