Lookimg up a PTS reference

Dear venerables and friends,

When I want to look up a PTS reference, I resort
to the hard copy. So, I'm at a lost when I don't
have access to that. What's the best way to look
it up with the computer? FYI, I've CST4, DPR, and PCED.

with mettâ,
Kumâra Bhikkhu