Cita APA (7th ed.)
Smith, T. L., & Zopf, P. E. (1970). Demography: Principles and methods. F. A. Davis Co..
Cita Chicago (17th ed.)
Smith, T. Lynn, i Paul E. Zopf. Demography: Principles and Methods. Philadelphia: F. A. Davis Co., 1970.
Cita MLA (9th ed.)
Smith, T. Lynn, i Paul E. Zopf. Demography: Principles and Methods. F. A. Davis Co., 1970.
Atenció: Aquestes cites poden no estar 100% correctes.