Hatfield, M. (2005). Strength training for muscle development: A step-by-step guide improve your strength 20-minute workouts. PRC Publishing.
Chicago-viite (17. p.)Hatfield, Mark. Strength Training for Muscle Development: A Step-by-step Guide Improve Your Strength 20-minute Workouts. Bramley Road, London: PRC Publishing, 2005.
MLA-viite (9. p.)Hatfield, Mark. Strength Training for Muscle Development: A Step-by-step Guide Improve Your Strength 20-minute Workouts. PRC Publishing, 2005.
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