Jarche shares 14 ways to acquire knowledge from the quintessential PKM practicer, Maria Popova at The Marginalian, and her review _You Can Do Anything_ by James Mangan, written in 1936. He then categorizes the methods in terms of how they align with PKM in this graphic from Jarche:
Maria Popova https://en.wikipedia.org/wiki/Maria_Popova http://themarginalian.org/
[[You Can Do Anything by James Mangan]] 1936 review: 14 ways to acquire K. https://www.themarginalian.org/2013/04/22/14-ways-to-acquire-knowledge-james-mangan-1936/ "prolific self-help guru and famous eccentric" https://archive.org/details/bwb_W8-ANG-369/ can be borrowed.