Looney, M. A., Spray, J. A., & Castelli, D. M. (1996). The task difficulty of free throw shooting for males and females. Research quarterly for exercise and sport, 67(3), S. 265-271. doi:10.1080/02701367.1996.10607953

Looney, Marilyn A., Judith A. Spray, and Darla M. Castelli. "The Task Difficulty of Free Throw Shooting for Males and Females." Research Quarterly for Exercise and Sport 67, no. 3 (1996): S. 265-271.

Looney, Marilyn A., Judith A. Spray, and Darla M. Castelli. "The Task Difficulty of Free Throw Shooting for Males and Females." Research Quarterly for Exercise and Sport 67.3 (1996): S. 265-271.