Knight, F. H. (1960). Intelligence and democratic action: [lectures delivered at the Thomas Jefferson Center for Studies in Political Economy, University of Virginia]. Harvard University Press.

Knight, Frank H. Intelligence and Democratic Action: [lectures Delivered at the Thomas Jefferson Center for Studies in Political Economy, University of Virginia]. Cambridge: Harvard University Press, 1960.

Knight, Frank H. Intelligence and Democratic Action: [lectures Delivered at the Thomas Jefferson Center for Studies in Political Economy, University of Virginia]. Harvard University Press, 1960.