When conducting research on Singapore see the recommended books listed here, including pages 313-318 of the Historical Dictionary of Singapore (New edition). This will provide a good introduction to doing research on the country. For articles see especially the database Perind and the Bibliography of Asian Studies.
Books
Offsets and defense industrialization in Indonesia and Singapore
Services liberalization in PTAs and the WTO : the experiences of India and Singapore
Singapore Industrial Relations System in the Globalization Era