Anggraini, D. R., L. Feriyawati, H. Hidayat, and A. S. Wahyuni. “Risk Factors Associated With Premature Hair Greying of Young Adult”. Open Access Macedonian Journal of Medical Sciences, vol. 7, no. 22, Nov. 2019, pp. 3762-4, doi:10.3889/oamjms.2019.498.