Last of Family Triumvirate. Philip La Follette, 68, Dies. In: Wisconsin State Journal. 19. August 1965, S.1 (englisch, Online in newspapers.com [abgerufen am 12. November 2020]).
Alice Honeywell: La Follette and His Legacy. Robert M. La Folette School of Public Affairs, abgerufen am 14. November 2020 (englisch): „… La Follette became the leader of the outspoken anti-war faction in the Senate“