1. Charles C. Gillispie, editor. (1970). Dictionary of Scientific Biography, Scribner's Sons, New York.
2. Luther P. Eisenhart. (1925). Riemannian Geometry, Princeton University Press.
3. Luther P. Eisenhart. (1933). Continuous Groups of Transformations, Princeton University Press.
4. Ed Regis. (1987). Who Got Einstein's Office? Addison-Wesley, New York.
5. John W. Dawson, Jr. (1997). Logical Dilemmas: The Life and Work of Kurt Gödel, A. K. Peters, Wellesley, Massachussetts, Chapter 9.