If you want to learn hardcore pure functional programming specifically
(not just a Lisp dialect in general), then I recommend a textbook that
uses Haskell, which is not a Lisp dialect.
For all other uses of Lisp dialects, I recommend some learning approach
that uses Racket. Go to
"http://docs.racket-lang.org/getting-started/index.html";, and choose
which textbook/document to start with.
(You'll find a lot of people who don't know Lisps saying "functional
programming", and Lisps *can* be used that way, but people who actually
want to teach FP usually pick a language that was designed for FP
exclusively. Trying to learn FP in a Lisp will be confusing. At the
same time, many people who think they want to learn "functional
programming" might actually prefer to be learning a Lisp in general
instead -- they just heard there was something they don't know, and they
heard a few terms, and they want to learn about this other thing(s).)
Neil V.
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