Cita APA (7th ed.)

Smith, T. L., & Zopf, P. E. (1976). Demography: Principles and methods (2nd edition.). Alfred Pub.

Cita Chicago (17th ed.)

Smith, Thomas Lynn, i Paul E. Zopf. Demography: Principles and Methods. 2nd edition. Port Washington, N.Y: Alfred Pub, 1976.

Cita MLA (9th ed.)

Smith, Thomas Lynn, i Paul E. Zopf. Demography: Principles and Methods. 2nd edition. Alfred Pub, 1976.