Siegel, J. S., Swanson, D. A., & Shryock, H. S. (2004). The Methods and materials of demography (2nd ed.). Elsevier Academic Press.
Lua i Stíl Chicago (17ú heag.)Siegel, Jacob S., David A. Swanson, agus Henry S. Shryock. The Methods and Materials of Demography. 2nd ed. Amsterdam: Elsevier Academic Press, 2004.
Lua MLA (9ú heag.)Siegel, Jacob S., et al. The Methods and Materials of Demography. 2nd ed. Elsevier Academic Press, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.