Singapore. Dept. of Statistics & Khoo, C. K. (1980). Census of population, 1980, Singapore: Release. Dept. of Statistics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Singapore. Dept. of Statistics και Chian Kim Khoo. Census of Population, 1980, Singapore: Release. Singapore: Dept. of Statistics, 1980.
Παραπομπή σε μορφή MLA (8th εκδ.)Singapore. Dept. of Statistics και Chian Kim Khoo. Census of Population, 1980, Singapore: Release. Dept. of Statistics, 1980.
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