If you are preparing for the NAB exam and looking for study material, you may purchase The Principles of Health Care Administration by Joseph E. Townsend through BNB Systems. You may contact them directly at 800-627-0874 or you can order online at www.ppandp.com.  The author, Mr. Joseph Townsend, has been a licensed Administrator for over 35 years and is the host of the NAB Review Seminar at LABENFA. The cost of the book is $145.00.