APA

Learned W. S., . (1924). The American public library and the diffusion of knowledge. New York: Harcourt.

Chicago

Learned William Setchel, . 1924. The American public library and the diffusion of knowledge. New York: Harcourt.

Harvard

Learned W. S., . (1924). The American public library and the diffusion of knowledge. New York: Harcourt.

MLA

Learned William Setchel, . The American public library and the diffusion of knowledge. New York: Harcourt. 1924.