J. J. Gerhardt

International SFTR method of measuring and recording joint motion

J. J. Gerhardt, 1975 .

Goniometric techniques for range-of-motion assessment.

J. J. Gerhardt, R. Rondinelli, J J Gerhardt, 2001, Physical medicine and rehabilitation clinics of North America.

An atlas of examination, standard measurements and diagnosis in orthopedics and traumatology

John J. Gerhardt, J. J. Gerhardt, King Ps, 1972 .

Range-of-motion measurements.

J. J. Gerhardt, J J Gerhardt, R D Lea, 1995, The Journal of bone and joint surgery. American volume.