Weeks, J. R. (2016). Population: An introduction to concepts and issues (Twelfth edition.). Cengage Learning.
Cita Chicago (17th ed.)Weeks, John Robert. Population: An Introduction to Concepts and Issues. Twelfth edition. Boston, MA, USA: Cengage Learning, 2016.
Cita MLA (9th ed.)Weeks, John Robert. Population: An Introduction to Concepts and Issues. Twelfth edition. Cengage Learning, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.