Cita APA (7a ed.)

Beal, G. M. (1958). How does social change occur? Cooperative Extension Service, Iowa State University.

Cita Chicago Style (17a ed.)

Beal, George M. How Does Social Change Occur? Ames, Iowa: Cooperative Extension Service, Iowa State University, 1958.

Cita MLA (9a ed.)

Beal, George M. How Does Social Change Occur? Cooperative Extension Service, Iowa State University, 1958.