"Clericalism and Socialism," by Enrico Ferri, Source: English translation in the Social Democrat, February 1903, Response to a questionnaire from the journal Le movement socialiste in 1902.
"The Revolutionary Method," Enrico Ferri, Source: International Socialist Journal, August 1905; Translated: by Ernest Untermann; First published: Il Socialismo, Vol. I., No.7, 1902.
"Socialism and Religious Beliefs," by Enrico Ferri, Source: Chapter 5 of Socialism and Positive Science, published in Italian, 1894, English translation, 1905.
