The best place to find approved study materials is from Microsoft. The exam page is here. http://www.microsoft.com/learning/en/us/exam.aspx?ID=70-451&locale=en-us#tab3
They list some resources but not a lot for direct prep materials for this exam. Apparently there is nothing from MS press on this one either.
They do list the topics covered. This might be a good place to start. As far as pointing to you a specific location I am afraid I am not going to be much, if any, help.
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