Hill, E. (1966). The language of drawing. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Hill, Edward. The Language of Drawing. Englewood Cliffs, N.J.: Prentice-Hall, 1966.
Lua MLA (9ú heag.)Hill, Edward. The Language of Drawing. Prentice-Hall, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.