@misc{the+method+of+managing+different+sorts+of+plastics+mixtures,
    author = {Skoneczna, Joanna i Skoneczny, Szymon},
    title = {The method of managing different sorts of plastics mixtures},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2011}
}