P C Van Wieringen

The effect of video-modelling and video-feedback on the learning of the tennis service by novices.

R J Bootsma, H H Emmen, L G Wesseling, 1985, Journal of sports sciences.

The effect of video-feedback on the learning of the tennis service by intermediate players.

R J Bootsma, P C Van Wieringen, H T Whiting, 1989, Journal of sports sciences.