Cheung, P. (1994). Statistics Singapore: An official guide. Dept. of Statistics.
Chicago-referens (17:e uppl.)Cheung, Paul. Statistics Singapore: An Official Guide. Singapore: Dept. of Statistics, 1994.
MLA-referens (8:e uppl.)Cheung, Paul. Statistics Singapore: An Official Guide. Dept. of Statistics, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.