Keeley, D. W., Wicke, J., Alford, K., & Oliver, G. D. (2010). Biomechanical analysis of forearm pronation and its relationship to ball movement for the two-seam and four-seam fastball pitches. Journal of strength and conditioning research, 24(9), S. 2366-2371. doi:10.1519/JSC.0b013e3181b22aea

Keeley, David W., Jason Wicke, Ken Alford, and Gretchen D. Oliver. "Biomechanical Analysis of Forearm Pronation and Its Relationship to Ball Movement for the Two-seam and Four-seam Fastball Pitches." Journal of Strength and Conditioning Research 24, no. 9 (2010): S. 2366-2371.

Keeley, David W., Jason Wicke, Ken Alford, and Gretchen D. Oliver. "Biomechanical Analysis of Forearm Pronation and Its Relationship to Ball Movement for the Two-seam and Four-seam Fastball Pitches." Journal of Strength and Conditioning Research 24.9 (2010): S. 2366-2371.