@misc{Cembruch-Nowakowski_Mariusz_Labels,
 author={Cembruch-Nowakowski, Mariusz},
 address={Koszalin},
 howpublished={online},
 publisher={Politechnika Koszalińska},
 language={eng},
 type={artykuł w czasopiśmie},
 title={Labels and certificates for green hotels},
 keywords={certificates, ecolabels, green hotels, hospitality sector, pro-ecological practices},
}