O'Donnell, M. (1950). Guidebook for Singing wheels: Fourth year (1950 edition.). Row, Peterson and Company.
Lua i Stíl Chicago (17ú heag.)O'Donnell, Mabel. Guidebook for Singing Wheels: Fourth Year. 1950 edition. Evanston, Illinois ; White Plains, New York: Row, Peterson and Company, 1950.
Lua MLA (8ú heag.)O'Donnell, Mabel. Guidebook for Singing Wheels: Fourth Year. 1950 edition. Row, Peterson and Company, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.