Ali, Shafqat, et al. “HISTOLOGICAL COMPARISON OF HUMAN THYMUS GLANDS BETWEEN GROUPS OF DIFFERENT AGES: Histological Comparison of Human Thymus Gland”. Pakistan Armed Forces Medical Journal, vol. 59, no. 4, Dec. 2009, pp. 403-7, https://pafmj.org/PAFMJ/article/view/1734.