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Lua i Stíl Chicago (17ú heag.)Berelson, Bernard. Population: Challenging World Crisis. [S.l: s.n.], 1969.
Lua MLA (9ú heag.)Berelson, Bernard. Population: Challenging World Crisis. s.n.], 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.