APA

Proudhon P. J., . (1927). Proudhon's solution of the social problem. New York: Vanguard Press.

Chicago

Proudhon Pierre Joseph, . 1927. Proudhon's solution of the social problem. New York: Vanguard Press.

Harvard

Proudhon P. J., . (1927). Proudhon's solution of the social problem. New York: Vanguard Press.

MLA

Proudhon Pierre Joseph, . Proudhon's solution of the social problem. New York: Vanguard Press. 1927.