Cita APA (7a ed.)

Ferrero, G. (1919). Problems of peace: From the Holy Alliance to the League of Nations : a message from a European writer to Americans. G.P. Putnam's Sons.

Cita Chicago Style (17a ed.)

Ferrero, Guglielmo. Problems of Peace: From the Holy Alliance to the League of Nations : A Message from a European Writer to Americans. New York [etc.]: G.P. Putnam's Sons, 1919.

Cita MLA (9a ed.)

Ferrero, Guglielmo. Problems of Peace: From the Holy Alliance to the League of Nations : A Message from a European Writer to Americans. G.P. Putnam's Sons, 1919.