There are several articles on Singapore minorities in the Family History Library. Look in the catalog under:
SINGAPORE - MINORITIES
Singapore's demographics describe a population of 4.48 million, as estimated by the last census in 2005 and is the fourth most densely populated country in the world. Singapore is a multiracial country with a majority population of Chinese, with substantial Malay and Indian minorities. Mahayana Buddhism is the first religion in Singapore though not representing a majority, with significant numbers following Islam, Christianity or no religion at all. The annual population growth rate for the year 2000 was 2.8%. The country has four official languages, and English is widely used, and Malay is the national language.