Memmert, D., Blanco, M., & Merkle, V. (2009). The effects of effort, performance, and expertise on apparent size perception in golf. International journal of sport psychology, 40(2), S. 270-283. http://www.dshs-koeln.de/wps/wcm/connect/a7c514004f00165a906ab111a279b932/the%2Beffects%2Bof%2Beffort%2C%2Bperformance%2C%2Band%2Bexpertise%2Bon%2Bapparent%2Bsize%2Bperception%2Bin%2Bgolf.pdf?MOD=AJPERES

Memmert, Daniel, Marissa Blanco, and Veronique Merkle. "The Effects of Effort, Performance, and Expertise On Apparent Size Perception in Golf." International Journal of Sport Psychology 40, no. 2 (2009): S. 270-283.

Memmert, Daniel, Marissa Blanco, and Veronique Merkle. "The Effects of Effort, Performance, and Expertise On Apparent Size Perception in Golf." International Journal of Sport Psychology 40.2 (2009): S. 270-283.