Frankel, L. B., & Bureau, P. R. (1970). This crowded world: An introduction to the study of population. Columbia Books.
Lua i Stíl Chicago (17ú heag.)Frankel, Lilian B., agus Population Reference Bureau. This Crowded World: An Introduction to the Study of Population. Washington D.C: Columbia Books, 1970.
Lua MLA (9ú heag.)Frankel, Lilian B., agus Population Reference Bureau. This Crowded World: An Introduction to the Study of Population. Columbia Books, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.