[bewuethr]

Two older ones:

The Elements of Programming Style

Software Tools / Software Tools in Pascal

I have read Elements and Software Tools in Pascal, and while partially definitely outdated ("avoid FORTRAN's three-way if"), excellent writing. Especially Software Tools in Pascal, which in large parts describes and explains source code; I was very impressed by the way the descriptions added lots of insights on top of just the code. Kernighan also manages to smuggle subtle bits of humour into texts about otherwise dry topics.

[noufalibrahim]

I believe TPoP is an updated version of Elements.