The 2007 edition of Dr. Anderson's best-seller, Cleanse & Purify Thyself, Book 1 is newly edited for the 21st century, easy-to-read and contains numerous handy references.
This is probably the best book on internal cleansing that you will ever read. It tells you how to create an internal cleansing program for yourself, and it leaves you with no doubt as to why you would! This is informative and inspiring reading.