Big men on campus: The Koch brothers' university donations are a veiled political weapon
Koch Dark-Money Operative Is Trump's Liaison to Congress –
Exclusive Audio: Inside the Koch Brothers' Secret Seminar – Mother Jones
Kochs key among small group quietly funding legal assault on campaign finance regulation – Center for Public Integrity
Koch brothers hope to raise even more funds at secretive right-wing gathering, Koch brothers
Kochland: The Secret History of Koch Industries and Corporate Power in America
Political activities of the Koch brothers - Wikipedia
Billionaire Koch brothers' network won't back Trump in 2020, snubbing his bid for second time
Koch brothers convene donor retreat as dark money spending set to soar, US political financing
Rebranding the Koch Brothers
The Kochtopus: sprawling network keeps David Koch's legacy thriving, Koch brothers