Sahley, B.J., Birkner, K.M. (2005). Heal with Amino Acids and Nutrients. Pain & Stress Publications. ISBN-13:978-1889391021file
Loomis, H.F.Jr. (2005). Enzymes, The Key to Health, Vol. 1 The Fundamentals. Enzyme Formulations Inc. ISBN-13:978-0976912408
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