@misc{_Rules,
 howpublished={online},
 publisher={Polski Rejestr Statków},
 language={eng},
 title={Rules for classification and construction of inland waterways vessels. Pt. 1, Classification regulations, January 2016},
 type={e-książka},
 keywords={statki, budownictwo okrętowe, normy, przepisy bezpieczeństwa},
}