APA (7th ed.) Citation

De Ruggiero, G., & Collingwood, R. G. (1959). The history of European liberalism. Beacon Press.

Chicago Style (17th ed.) Citation

De Ruggiero, Guido, and R. G. Collingwood. The History of European Liberalism. Boston, Mass: Beacon Press, 1959.

MLA (8th ed.) Citation

De Ruggiero, Guido, and R. G. Collingwood. The History of European Liberalism. Beacon Press, 1959.