Chappell, A. ., Simper, T. ., & Barker, M. . Nutritional strategies of high level natural bodybuilders during competition preparation. Journal of the International Society of Sports Nutrition, 15, 4. https://doi.org/10.1186/s12970-018-0209-z (Original work published 2018)

Chappell, A. ., Simper, T. ., Trexler, E. ., & Helms, E. . (2021). Biopsychosocial Effects of Competition Preparation in Natural Bodybuilders. Journal of Human Kinetics, 79, 259-276. https://doi.org/10.2478/hukin-2021-0082