https://www.forbes.com/sites/neilhowe/2017/10/02/youre-not-the-man-your-father-was/

https://www.urologytimes.com/view/testosterone-levels-show-steady-decrease-among-young-us-men

https://medicine.umich.edu/sites/default/files/content/downloads/What Is a Normal Testosterone Level for Young Men Rethinking the 300 ngdL Cutoff for Testosterone Deficiency in Men 20-44 Years Old.pdf

https://www.oregonlive.com/health/2013/08/chopping_wood_boosts_testoster.html

Ieteiktā grāmata - https://www.amazon.com/Bigger-Leaner-Stronger-Building-Ultimate-ebook/dp/B006XF5BTG