Westoff, L. A. (1971). From now to zero: Fertility, conception and abortion in America. Little, Brown and Co..
Lua i Stíl Chicago (17ú heag.)Westoff, Leslie Aldridge. From Now to Zero: Fertility, Conception and Abortion in America. Boston: Little, Brown and Co., 1971.
Lua MLA (9ú heag.)Westoff, Leslie Aldridge. From Now to Zero: Fertility, Conception and Abortion in America. Little, Brown and Co., 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.