Parkinson's Disease Foundation (U.S.), Parkinson's Disease Information and Research Center (New York, N.Y.), National Institute of Neurological Diseases and Blindness (U.S.), Purpura, D. P., & Yahr, M. D. (1967). Neurophysiological basis of normal and abnormal motor activities: Edited by Melvin D. Yahr and Dominick P. Purpura; proceedings of the third symposium of the Parkinson's Disease Information and Research Center of Columbia University, November 28th and 29th, 1966. Raven Press.

Parkinson's Disease Foundation (U.S.), N.Y.) Parkinson's Disease Information and Research Center (New York, National Institute of Neurological Diseases and Blindness (U.S.), Dominick P. Purpura, and Melvin D. Yahr. Neurophysiological Basis of Normal and Abnormal Motor Activities: Edited by Melvin D. Yahr and Dominick P. Purpura; Proceedings of the Third Symposium of the Parkinson's Disease Information and Research Center of Columbia University, November 28th and 29th, 1966. Hewlett, N. Y.: Raven Press, 1967.

Parkinson's Disease Foundation (U.S.), et al. Neurophysiological Basis of Normal and Abnormal Motor Activities: Edited by Melvin D. Yahr and Dominick P. Purpura; Proceedings of the Third Symposium of the Parkinson's Disease Information and Research Center of Columbia University, November 28th and 29th, 1966. Raven Press, 1967.