APA

Ellwood C. A., . (1938). A history of social philosophy. New York: AMS Press.

Chicago

Ellwood Charles A, . 1938. A history of social philosophy. New York: AMS Press.

Harvard

Ellwood C. A., . (1938). A history of social philosophy. New York: AMS Press.

MLA

Ellwood Charles A, . A history of social philosophy. New York: AMS Press. 1938.