Lowe, N. M., B. Ellahi, Q. Bano, S. A. Bangash, S. R. Mitra, and M. Zaman. “Dietary Calcium Intake, Vitamin D Status, and Bone Health in Postmenopausal Women in Rural Pakistan”. Journal of Health, Population and Nutrition, vol. 29, no. 5, Nov. 2011, pp. 465-70, doi:10.3329/jhpn.v29i5.8900.