Dallmeyer, S., Hallmann, K. & Breuer, C., 2020, The Rise and Size of the Fitness Industry in Europe: Fit for the Future?. Scheerder, J., Vehmas, H. & Helsen, K. (eds.). Cham: Palgrave Macmillan, p. 221-24020 p. (The Rise and Size of the Fitness Industry in Europe).
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