1. American Mathematical Society (1938), Semicentennial Addresses, American Mathematical Society, New York. (Volume 2 of American Mathematical Society Semicentennial Publications.)
2. Anonymous (1931), A memorial to a scholar-teacher, Princeton Alumni Weekly, 30 October 1931, pp. 111–113.
3. Archibald, R.C. (1938), A Semicentennial History of the American Mathematical Society 1888–1938, Vol 1, American Mathematical Society, New York.
4. Aspray, W. (1988), The emergence of Princeton as a world center for mathematical research, 1896–1939, in W. Aspray and P. Kitcher (eds.), History and Philosophy of Modern Mathematics, University of Minnesota Press, Minneapolis, pp. 344–364.
5. Bienen, L.B. (1970), Notes found in a Klein bottle, Princeton Alumni Weekly, 21 April 1970, pp. 17–20.