Cross, R. and Pollard, G. (2009) Grand Slam men's singles tennis 1991-2009 Serve speeds and other related data. ITF Coaching and Sport Science Review, 49 : 8-10.
Cross, R. and Lindsey, C. (2005) Technical Tennis: Racquets, Strings, Balls, Courts, Spin, And Bounce. Racquet Tech Publishing: California.
Goodwill, S. R., Capel-Davies, J., Haake, S. J., and Miller, S.(2007) Ball spin generation by elite players during match play. In: Miller, S. and Capel-Davies, J., (eds.) Tennis science and technology 3. International Tennis Federation, 349-356.
Lieven, V, Bob, M. and Daniel, B (2004) Authentic Evaluation of Forehand Groundstrokes in Young Low- to Intermediate-Level Tennis Players. Medicine & Science in Sports & Exercise, 36 : 2099-2106.