C. D. Broad Review of Erwin Freundlich, <em>The Foundations of Einstein's Theory of Gravitation</em> articleReview of Erwin Freundlich, The Foundations of Einstein's Theory of GravitationC. D. BroadMind, vol. 30, no. 117, 1921, pp. 101–102PDFNotes citing this workC. D. Broad: a bibliography