APA (7th ed.) Citation

O'Donnell, M., Hoopes, F., & Hoopes, M. C. (1938). Happy days. Row, Peterson and Company.

Chicago Style (17th ed.) Citation

O'Donnell, Mabel, Florence Hoopes, and Margaret Campbell Hoopes. Happy Days. [Evanston, Ill.]: Row, Peterson and Company, 1938.

MLA (8th ed.) Citation

O'Donnell, Mabel, et al. Happy Days. Row, Peterson and Company, 1938.