1. Dilpare, A.: Course Notes ME E8405 Columbia University Fall 1965
2. Columbia University: School of Engineering and Applied Sciences Bulletin 1965-1966, Columbia University. New York, NY. Series 65, Number 5, 28 May 1965. https://findingaids.library.columbia.edu/ead/nnc-ua/ldpd_14621921/dsc
3. Erdman, A.G.: Modern Kinematics: Developments in the Last Forty Years. Wiley, Hoboken (1993). ISBN 9780471554592
4. Roth, B.: In memory of professor ferdinand freudenstein, 1926–2006. ASME J. Mech. Des. 129(3), 241–242 (2007)
5. Florida Institute of Technology, Ad Astra Yearbook, p. 217 (1986). http://books.yearbookscanning.com/bookcase/egqzw