APA (7th ed.) Citation

Popenoe, J., & Gironella, F. (1975). Summerhill (3a ed.). Editorial Laia.

Chicago Style (17th ed.) Citation

Popenoe, Joshua, and Francesc Gironella. Summerhill. 3a ed. Barcelona: Editorial Laia, 1975.

MLA (9th ed.) Citation

Popenoe, Joshua, and Francesc Gironella. Summerhill. 3a ed. Editorial Laia, 1975.