Gill, R. W. (1984). The Thames and Hudson manual of rendering with pen and ink (Rev. and enl. ed.). Thames and Hudson.

Gill, Robert W. The Thames and Hudson Manual of Rendering with Pen and Ink. Rev. and enl. ed. London ; New York: Thames and Hudson, 1984.

Gill, Robert W. The Thames and Hudson Manual of Rendering with Pen and Ink. Rev. and enl. ed. Thames and Hudson, 1984.