How David Koch Changed the World | The New Republic
https://newrepublic.com/article/154836/david-koch-changed-world
“Kochland” Examines the Koch Brothers’ Early, Crucial Role in Climate-Change Denial | The New Yorker
https://www.newyorker.com/news/daily-comment/kochland-examines-how-the-koch-brothers-made-their-fortune-and-the-influence-it-bought