Frankel, L. B. (1970). This crowded world; an introduction to the study of population. Columbia Books.
Lua i Stíl Chicago (17ú heag.)Frankel, Lillian Berson. This Crowded World; an Introduction to the Study of Population. Washington: Columbia Books, 1970.
Lua MLA (9ú heag.)Frankel, Lillian Berson. 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.