Singapore. Dept. of Statistics. (1978). Report on survey of households, April 1977. Dept. of Statistics.
Lua i Stíl Chicago (17ú heag.)Singapore. Dept. of Statistics. Report on Survey of Households, April 1977. Singapore: Dept. of Statistics, 1978.
Lua MLA (8ú heag.)Singapore. Dept. of Statistics. Report on Survey of Households, April 1977. Dept. of Statistics, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.