Science & Sanity is the best book on thinking and I've read about twenty. It is available FREE in its entirety at:
http://www.rodsmith.org.uk/alfred-korzybski/
Korzybski influenced a lot of great thinkers. He started the General Semantics movement and founded a journal called ETC
Korzybski invented many tools that help clear thinking by using language properly. The gesture of putting quotes with your fingers while talking is one of those techniques. It is used to make it clear that you are using a semantically loaded word that may need clarification.
Basically, you learn to be cautious about the "IS" of identification. The word "is" locks you into biased thinking habits.
Avoid abolutes like "ALL" or "NEVER".
Use indexing of words Dog (1) is not Dog (2) Husband (6:00am) is not the same as Husband (6:00pm)
You (1974) is not the same as You (1984)
Look in the bibliography of a lot of popular therapists books and you will find Korzybski quoted.
If you want a simple discussion of Korzybski's General Semantics order a copy of
How to develop your thinking ability by Kenneth S. Keys
http://www.amazon.com/How-Develop-Your-Thinking-Ability/dp/0070344612
Keys was the guy that used to publish the Hazel cartoons. His book discusses Korzybski's techniques and illustrates them with cartoons. If you have kids you should study it with them instead of "family worship".
Other than Science & Sanity it's useful to learn the major logical fallacies. But, really, those fallacies need to be combined with General Semantic tecchniques because it helps slice through things that are more sophisticated in their construction. Logical fallacies are like spell checkers. They catch mispelled word but not words that are spelled properly but used improperly. Some things are constructed logically but the basic premise is out of touch with reality and that's where General Semantics helps.
And don't feel bad if you aren't always logical. No one is. Our minds are not constructed for logic. It is a habit that has to be reinforced every day.
Ray Franz wrote quite a bit about fallacies in one of his books. But look closely at Ray's personal beliefs. He continued to believe the Bible was God's Word. He didn't believe man evolved. He believed in original sin and the flood of Noah etc. Just knowing a few falacies will not get you into reality if your premises are screwed up.