Sless, D. (1981). Learning and visual communication. Croom Helm ; Wiley.
Lua i Stíl Chicago (17ú heag.)Sless, David. Learning and Visual Communication. London : New York: Croom Helm ; Wiley, 1981.
Lua MLA (8ú heag.)Sless, David. Learning and Visual Communication. Croom Helm ; Wiley, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.