Well, yesterday afternoon, I went to the Lee Kong Chian
Reference Library of National Library, located on the 11th
storey.
At the same rack as the reference books for buses (such as TL
guides), I also found some books/booklets about taxis, below the TL
guides.
They were namely:
1) Singapore Taxi Service (a 1980s book published by EPB)
2) Taxi Guide (also in 1980s by NTUC Comfort?)
3) Cabby newsletter for Citycab/Yellow-Top cab.
To find them, first take a lift to 11th storey, put down any bags
with you into the locker(a must!), go into the reference library
until reaching the corridor that is between two book racks, and
walk until you see the rack of audio-visual materials to your
right.
Then turn right and walk until you find the TL guides to your
right.
And look into the two racks that is below the TL guides.
The books about taxis are found in these two racks.
Enjoy reading and researching more about taxis!