Charters, W. W., Smiley, D. F., Strang, R. M., & Seredy, K. (1937). Happy days. The Macmillan Company.
Lua i Stíl Chicago (17ú heag.)Charters, W. W., Dean Franklin Smiley, Ruth May Strang, agus Kate Seredy. Happy Days. New York: The Macmillan Company, 1937.
Lua MLA (8ú heag.)Charters, W. W., et al. Happy Days. The Macmillan Company, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.