Adam, J. J., & Wieringen, P. C. (1983). Relationships between anxiety and performance on two aspects of a throwing task. International journal of sport psychology, 14(3), S. 174-185.

Adam, Jos J.M.E., and Piet C.W Wieringen. "Relationships between Anxiety and Performance On Two Aspects of a Throwing Task." International Journal of Sport Psychology 14, no. 3 (1983): S. 174-185.

Adam, Jos J.M.E., and Piet C.W Wieringen. "Relationships between Anxiety and Performance On Two Aspects of a Throwing Task." International Journal of Sport Psychology 14.3 (1983): S. 174-185.