Styl cytowania APA

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

Styl cytowania Chicago

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

Styl cytowania MLA

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