Bowden, Robert Douglas. Boies Penrose: Symbol of an Era. Freeport, NY: Books for Libraries Press, 1971 (reprint of 1937 ed.) .

A lively account of Penrose from the 1890s to 1920 that does full justice to this larger-than-life figure’s manipulation of political life in the state and his national influence.

Referenced in:
Pennsylvania Politics 1865-1930.