SİYAHTAŞ, A. 2017. EXAMINATION OF THE NUMBER OF COACHES THAT THE TEAMS HAVE SIGNED A CONTRACT IN RECENT YEARS IN TURKISH PROFESSIONAL FOOTBALL LEAGUES. INTERNATIONAL JOURNAL OF SOCIAL HUMANITIES SCIENCES RESEARCH. 5, 27 (Nov. 2017), 2896–2906. DOI:https://doi.org/10.26450/jshsr.667.