An Indonesian Version of Mental Toughness Index: Testing Psychometric Properties in Athletes and Non-athletes by Miftah Fariz Prima Putra, Kurdi Kurdi, Syahruddin Syahruddin, Sanusi Hasibuan, Albadi Sinulingga, Ilham Kamaruddin, Advendi Kristiyandaru, Mashud Mashud, Imam Hariadi, Tri Setyo Guntoro, Sutoro Sutoro, Evi Sinaga, Ibrahim Ibrahim, Edi Setiawan, Mochamad Ridwan

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