@misc{_Rules,
 howpublished={online},
 publisher={Polski Rejestr Statków},
 language={eng},
 title={Rules for statutory survey of sea-going ships. Pt. 9, Environmental protection, 2018 July},
 type={e-książka},
 keywords={Polska, statki, kontrola techniczna, normy, środowisko, ochrona},
}