Erwin, J. (2007). New Directions for Strings: A comprehensive string method / Joanne Erwin. FJH Music Co..
Lua i Stíl Chicago (17ú heag.)Erwin, Joanne. New Directions for Strings: A Comprehensive String Method / Joanne Erwin. Fort Lauderdale, Fla.: FJH Music Co., 2007.
Lua MLA (8ú heag.)Erwin, Joanne. New Directions for Strings: A Comprehensive String Method / Joanne Erwin. FJH Music Co., 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.