APA (7th ed.) Citation

National Book League (Great Britain), Lines, K., & Jones, H. (1950). Four to fourteen: A library of books for children. Cambridge University Press.

Chicago Style (17th ed.) Citation

National Book League (Great Britain), Kathleen Lines, and Harold Jones. Four to Fourteen: A Library of Books for Children. [London]: Cambridge University Press, 1950.

MLA (9th ed.) Citation

National Book League (Great Britain), et al. Four to Fourteen: A Library of Books for Children. Cambridge University Press, 1950.