Wahjoepramono, Eka J. “The Association Between Serum Testosterone Levels and Cognitive Function of Men Aged 50 Years or More”. Medical Journal of Indonesia 18, no. 1 (February 1, 2009): 36–40. Accessed December 6, 2024. http://mji.ui.ac.id/journal/index.php/mji/article/view/338.