@misc{Gros_J._„Eco-signs,
 author={Gros, J. and Pająk, K. and Krzeczkowska, M.},
 howpublished={online},
 publisher={Pedagogical University of Kraków},
 language={eng},
 title={„Eco-signs on stage” - excursion},
 type={referat},
 type={artykuł z pracy zbiorowej},
 keywords={natural science education, didactic materials, environmental education},
}