There are a large number of web sites and books on the subject. Some of these are listed below:
Web Sites
Acupressure
http://medical-dictionary.thefreedictionary.com/acupressure+massage
The Official Website for Acupressure
http://www.acupressure.com/
What are Acupressure and Shiatsu. How Do They Work?
http://www.lifecircles-inc.com/wellnessarticles/acupressure.html
General Acupressure Points to Stay Fit Acupressure and Reflex Points for Common Ailments
http://bhojraj.tripod.com/stayfit.html
Acupressure - Pressure Points Therapy 84
http://rajanjolly.hubpages.com/hub/Acupressure-An-Alternative-Medicine
Acupressure Therapy : Acupressure Points for Stress
http://www.youtube.com/watch?feature=endscreen&NR=1&v=_AIYmMv_Bnw
Books
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Acupressure: clinical applications in musculo-skeletal conditions By John R. Cross, Dr. John R. Cross
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The healing power of acupressure and acupuncture: by Matthew D. Bauer
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Acupressure: how to cure common ailments the natural way by Michael Reed Gach
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Acupressure Cure For Common Diseases by Dr. K Kenyon
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Acupressure Facelift: How to Do It Yourself by Deborah Hobart Crow, Deborah Hobart Crow ND
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Acupressure Guide For Headache and Migraine Treatment (Mobi Health) By Mobile Reference