Helin, P. (1988). Psychophysiological activation during performance and competition and the effects of relaxation training and running exercise. University of Kuopio.
Čikaški stil citiranja (17. izdanje)Helin, Pertti. Psychophysiological Activation During Performance and Competition and the Effects of Relaxation Training and Running Exercise. Kuopio: University of Kuopio, 1988.
MLA način citiranja (8. izdanje)Helin, Pertti. Psychophysiological Activation During Performance and Competition and the Effects of Relaxation Training and Running Exercise. University of Kuopio, 1988.
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