Krustrup, P., Mohr, M., Nybo, L., Jensen, J. M., Nielsen, J. J., & Bangsbo, J. (2006). The Yo-Yo IR2 test: Physiological response, reliability, and application to elite soccer. Medicine and science in sports and exercise, 38(9), 1666. https://doi.org/10.1249/01.mss.0000227538.20799.08
Chicago Style (17th ed.) CitationKrustrup, Peter, Magni Mohr, Lars Nybo, Jack Majgaard Jensen, Jens Jung Nielsen, and Jens Bangsbo. "The Yo-Yo IR2 Test: Physiological Response, Reliability, and Application to Elite Soccer." Medicine and Science in Sports and Exercise 38, no. 9 (2006): 1666. https://doi.org/10.1249/01.mss.0000227538.20799.08.
MLA (9th ed.) CitationKrustrup, Peter, et al. "The Yo-Yo IR2 Test: Physiological Response, Reliability, and Application to Elite Soccer." Medicine and Science in Sports and Exercise, vol. 38, no. 9, 2006, p. 1666, https://doi.org/10.1249/01.mss.0000227538.20799.08.