Sweezy, A. (1973). Labor shortage and population policy. California Institute of Technology.
Lua i Stíl Chicago (17ú heag.)Sweezy, Alan. Labor Shortage and Population Policy. Pasedena, Calif: California Institute of Technology, 1973.
Lua MLA (9ú heag.)Sweezy, Alan. Labor Shortage and Population Policy. California Institute of Technology, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.