Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Smith, T. Lynn, i Paul E. Zopf. Demography: Principles and Methods. 2nd ed. Port Washington, New York: Alfred Publication, 1976.

Cita MLA (9th ed.)

Smith, T. Lynn, i Paul E. Zopf. Demography: Principles and Methods. 2nd ed. Alfred Publication, 1976.