Need a good LDAP book - which one?

[Neal Rauhauser <isptech@americanrelay.com>]

         I've installed ldap 1.2.11 on FreeBSD 4.3 release, read the
pages @ openldap.org and read the sections about ldap in the Oreilly's
Perl for System Administration book.


        I've managed to bring the daemon up, make simple queries, and
create a few records by using the tools found here to create prototypes.

http://www.padl.com/tools.html

    What I am hoping to accomplish with it is this:

    storage of user ID, password, and possibly some other bits of
information
    freeradius authentication via LDAP
    qmail authentication via LDAP


    I'm a tolerably good unix admin, I've written a line or two of perl
over the years, and I am comfortable twisting the knobs on freeradius
and qmail. I'd like someone to recommend a book, preferably a good thick
one, which will give me All Of The Power(tm) over OpenLDAP - does such a
thing exist? Or am I really going to have to read RFCs & source code, as
has been suggested by an LDAP guru I know?