Suppose you set to work somewhat in this way to gather references on"Thinking:" First you look over your book titles, and there is Schaeffer's "Thinking and Learning to Think." Near it is Kramer's "Talks to Students on the Art of Study"--that seems likely to provide some material, and it does. Naturally you think next of your book on psychology, and there is help there. If you have a volume on the human intellect you will have already turned to it. Suddenly you remember your encyclopedia and your dictionary of quotations--and now material fairly rains upon you; the problem is what _not_ to use. In the encyclopedia you turn to every reference that includes or touches or even suggests"thinking;" and in the dictionary of quotations you do the same. The latter volume you find peculiarly helpful because it suggests several volumes to you that are on your own shelves--you never would have thought to look in them for references on this subject. Even fiction will supply help, but especially books of essays and biography. Be aware of your own resources.
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