hat
^ "Kalsyòm ak vitamin D siyifikativman diminye ka zo kase estrès". http://www.keysupplements.com/articles/Calcium-Bones.htm. Rekipere 2007-02-20.
eng
^ "Calcium and Vitamin D significantly reduce stress fractures". http://www.keysupplements.com/articles/Calcium-Bones.htm. Retrieved 2007-02-20.