D. C. Welten

Weight‐bearing activity during youth is a more important factor for peak bone mass than calcium intake

H C Kemper, W. Mechelen, J. Twisk, 1994, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

Nutrient intake of physically fit and unfit men and women.

S. Blair, S. Blair, S. Brodney, 2001, Medicine and science in sports and exercise.