APA

Sperry W. L., . (1921). The disciplines of liberty. New Haven: Yale university press; [etc., etc.].

Chicago

Sperry Willard Learoyd, . 1921. The disciplines of liberty. New Haven: Yale university press; [etc., etc.].

Harvard

Sperry W. L., . (1921). The disciplines of liberty. New Haven: Yale university press; [etc., etc.].

MLA

Sperry Willard Learoyd, . The disciplines of liberty. New Haven: Yale university press; [etc., etc.]. 1921.