Best Ada book?

[s0222353@moncol.monmouth.edu (DEAN RUNZEL)]

I've been asked by some friends to recommend a general Ada book for use as
their desk reference. I'm aware of Michael Feldman's book which is a great
first Ada book but it doesn't cover tasking. I'm also aware of Norman Cohen's
book and Grady Booch's "Software Engineering with Ada" and Naiditch's 
"Rendevous with Ada". I'm not sure which book to recommend. They are all
DoD software engineering interns and have had a year of Ada education 
using both Feldman's and Cohen's books. I know AJPO was working on a project
to include a textbook with a compiler. Is this available? Please don't 
recommend the LRM. What these guys are looking for is an easy to read and
understand book that they can use in their daily work efforts and as a 
continual educational resource. I'm sure no one book is truly sufficient 
but I can only recommend one due to limited funds. Any input would be 
appreciated.

Thanks in advance,
  Dean R. Runzel