@misc{Bielec_Grzegorz_Methodological,
 author={Bielec, Grzegorz},
 copyright={Akademia Wychowania Fizycznego w Poznaniu},
 howpublished={online},
 publisher={Akademia Wychowania Fizycznego w Poznaniu},
 language={eng},
 type={artykuł},
 title={Methodological and organizational problems in teaching swimming},
 keywords={swimming, class, problems, children},
}