Cita APA (7a ed.)

Childs, H. L. (1940). An introduction to public opinion. Wiley & Sons.

Cita Chicago Style (17a ed.)

Childs, Harwood L. An Introduction to Public Opinion. New York: Wiley & Sons, 1940.

Cita MLA (9a ed.)

Childs, Harwood L. An Introduction to Public Opinion. Wiley & Sons, 1940.