Immerwahr, G. (1981). Contraceptive use in Sri Lanka. International Statistical Institute ; World Fertility Survey.
Lua i Stíl Chicago (17ú heag.)Immerwahr, George. Contraceptive Use in Sri Lanka. Voorburg, Netherlands : London: International Statistical Institute ; World Fertility Survey, 1981.
Lua MLA (8ú heag.)Immerwahr, George. Contraceptive Use in Sri Lanka. International Statistical Institute ; World Fertility Survey, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.