7. Konik, M. (1995). Gary Player: Over 30 years with the PGA and still up to par. Nautilus, 4: 38-42 (Summer).
8. Menkes, A., Mazel, S., Redmond R., et al. (1993). Strength training increases regional bone mineral density and bone remodeling in middle-aged and older men. Journal of Applied Physiology, 74: 2478-2484.
9. Risch, S., Nowell, N., Pollock, M. et al. (1993). Lumbar strengthening in chronic low back pain patients. Spine, 18:232-238.
10.Stone, M., Blessing, D., Byrd, R., et al. (1982). Physiological effects of a short term resistive training program on middle-aged untrained men. National Strength and Conditioning Association Journal, 4: 16-20.
11.Tufts University Diet and Nutrition Letter. (1994). Never too late to build up your muscle. 12:6-7 (September).
12.Westcott, W. (1995). Strength Fitness: Fourth Edition, Dubuque, Iowa: Wm. C.Brown Publishers.