O'Donnell, M., Hoopes, F., & Hoopes, M. C. (1938). Happy days. Row, Peterson and Company.
Lua i Stíl Chicago (17ú heag.)O'Donnell, Mabel, Florence Hoopes, agus Margaret Campbell Hoopes. Happy Days. [Evanston, Ill.]: Row, Peterson and Company, 1938.
Lua MLA (8ú heag.)O'Donnell, Mabel, et al. Happy Days. Row, Peterson and Company, 1938.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.