I ordered them because they go with the e-book here. I like to highlight information as I read it and have something to refer to later on. The workbook can add to the studying for me I have a slight learning disability. I just takes me a little longer to grasp things when I read them. The books are at Amazon.com, textbook was about $55, workbook about $33. There might be other sites too where you can get them.
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