@misc{Youngson_Peter_Extra,
 author={Youngson, Peter},
 howpublished={online},
 publisher={James Munro & Co., Ltd.},
 language={eng},
 title={Extra chief engineers' and surveyors' guide : to the examinations of the board of trade},
 keywords={poradnik inżyniera mechanika, maszyny okrętowe, poradnik mechanika},
}