Maybe somebody knows a good Bourne Shell book or tutorial?

[Yuri]

Asking here because it is used in FreeBSD a lot.

Most google queries about Bourne Shell aspects bring answers like this: 
Not sure, but if this was in bash, you could <blah blah blah> ....
And most documents found online aren't comprehensive, and only cover 
beginner questions. No books on amazon look promising either.

There are some quite tricky areas and questions about sh and hard to 
find information.

Anybody knows of some good book that would cover all essential issues of 
Bourne shell programming?

Yuri