@misc{Polski_Rejestr_Statków_Rules,
 author={Polski Rejestr Statków},
 howpublished={online},
 publisher={Polski Rejestr Statków},
 language={eng},
 type={e-książka},
 title={Rules for the classification and construction of small sea-going ships. Part 1, Classification regulations : November 2020},
 keywords={klasyfikacja, statki},
}