Mehrdad Estiri, Mohammad Haghighi, Reza Mohammadkazemi, Hamzeh Rayej & Mohammad Jahed (2010). "Promotion in Iran's Football Pro-league: Important but Weak!"(PDF). International Journal of Applied Sports Sciences. Korea Institute of Sports Science. 22 (1): 62. Diarsipkan dari versi asli(PDF) tanggal 2012-04-26. Diakses tanggal 17 December 2011.Pemeliharaan CS1: Banyak nama: authors list (link)
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Mehrdad Estiri, Mohammad Haghighi, Reza Mohammadkazemi, Hamzeh Rayej & Mohammad Jahed (2010). "Promotion in Iran's Football Pro-league: Important but Weak!"(PDF). International Journal of Applied Sports Sciences. Korea Institute of Sports Science. 22 (1): 62. Diarsipkan dari versi asli(PDF) tanggal 2012-04-26. Diakses tanggal 17 December 2011.Pemeliharaan CS1: Banyak nama: authors list (link)