Saha, Sanjoy, Wilna Oldewage-Theron, and Carin Napier. “Be Active: A Food-Based Dietary Guideline for Elderly South Africans”. South African Journal of Clinical Nutrition 34 (September 22, 2021): S21-S26. Accessed December 9, 2021. http://sajcn.redbricklibrary.com/index.php/SAJCN/article/view/1562.