Please point me to best-selling books AND articles AND online material
regarding great poker playing AND to associations AND online forums
dedicated to professional (not recreational) poker play.

Looking for information that one would digest and master to become
expert at low-stakes poker (specifically online real-money poker
rooms) from strategic, tactical, AND psychological perspectives. 

A good answer will be clear and organized, with the references sorted
into meaningful groups.

Am NOT interested in material that makes value judgments regarding
gambling in general or poker playing in particular, except insofar as
that material is relevant to understanding the psychology of winning
at poker.