Searches in SOLO will reveal both ebooks and hard copy.
For commentary on the Singaporean constitution, books with shelf marks beginning Cw Sing are on Level 1, one floor beneath the entrance level.
Comparative studies, which have shelf marks beginning General or Cw Gen are shelved on Level 2, the entrance level to the Law Library
For citations to articles in the current constitution, a widely recognised practice is to use the following abbreviation:
Const., Art. 1
For any of the earlier constitutions, put the year of its formation first eg. 1946 Const., Art. 2