APA (7th ed.) Citation

Society for Promoting Christian Knowledge (Great Britain), National Society for Promoting Religious Education (Great Britain), & Openshaw, O. F. (1943). I saw three ships: Traditional carol. The Challenge, S.P.C.K., & National Society.

Chicago Style (17th ed.) Citation

Society for Promoting Christian Knowledge (Great Britain), National Society for Promoting Religious Education (Great Britain), and Olive F. Openshaw. I Saw Three Ships: Traditional Carol. [London]: The Challenge, S.P.C.K., & National Society, 1943.

MLA (9th ed.) Citation

Society for Promoting Christian Knowledge (Great Britain), et al. I Saw Three Ships: Traditional Carol. The Challenge, S.P.C.K., & National Society, 1943.