Leex and Yecc, tutorials, webpages?

Working with a small group on parsing to a given grammar.
Looking at Leex and Yecc in the Erlang domain.

Most (some pretty good) sites seem to be using OOD syntax?

Looking for a recommendation please, a site / book / … to try and pick up these two.

Not a CS grad, but plenty of programming experience. Even argued with Joe A over printing his book!