Mental toughness: are there differences between athletes and non-athletes, education levels, and gender? by Miftah Fariz Prima Putra, Sutoro Sutoro, Tery Wanena, Kurdi Kurdi, Yos Wandik, Ivon Marlin Dike, Carles Mulait, Marsya Venesa Pattinussa, Nomia Pahabol, Daniel Womsiwor

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