Cita APA (7a ed.)

Spencer, D. A., & Spencer, H. (1877). The study of sociology. D. Appleton & Cy..

Cita Chicago Style (17a ed.)

Spencer, D. A., y Herbert Spencer. The Study of Sociology. New York: D. Appleton & Cy., 1877.

Cita MLA (8a ed.)

Spencer, D. A., y Herbert Spencer. The Study of Sociology. D. Appleton & Cy., 1877.