Sweeting, G. (1974). How to be a chalk artist (13ª ed.). Zondervan.
Lua i Stíl Chicago (17ú heag.)Sweeting, George. How to Be a Chalk Artist. 13ª ed. Zondervan, 1974.
Lua MLA (9ú heag.)Sweeting, George. How to Be a Chalk Artist. 13ª ed. Zondervan, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.