Rahman, U. uR, N. Hamid, U. , N. Ahmad, M. Safeer, M. Tariq, and J. ur Rehman. “THE AGE AT WHICH TESTOSTERONE STARTS DECREASING IN MEN NOW-A-DAYS”. KHYBER MEDICAL UNIVERSITY JOURNAL, vol. 4, no. 4, Dec. 2012, pp. 174-8, https://www.kmuj.kmu.edu.pk/article/view/9720.