Singapore. Dept. of Statistics & Khoo, C. K. (1980). Census of population, 1980, Singapore: Release. Dept. of Statistics.
Lua i Stíl Chicago (17ú heag.)Singapore. Dept. of Statistics agus Chian Kim Khoo. Census of Population, 1980, Singapore: Release. Singapore: Dept. of Statistics, 1980.
Lua MLA (8ú heag.)Singapore. Dept. of Statistics agus Chian Kim Khoo. Census of Population, 1980, Singapore: Release. Dept. of Statistics, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.