I am going through it just now. Very good book and it is from Baker Academic, easy deal, I guess?
http://www.amazon.com/Knocking-Heavens-Door-Testament-Petitionary/dp/080102689X/ref=sr_1_1?ie=UTF8&qid=1299853170&sr=8-1
From page 88. Prayer is not made more efficacious by repetition. One can only hope that this tenacious misinterpretation will soon be laid to rest once and for all.
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