Gratton, C., & Jones, I. (2004). Research methods for sport studies. Routledge.
Lua i Stíl Chicago (17ú heag.)Gratton, Chris, agus Ian Jones. Research Methods for Sport Studies. London: Routledge, 2004.
Lua MLA (9ú heag.)Gratton, Chris, agus Ian Jones. Research Methods for Sport Studies. Routledge, 2004.
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