@misc{Chrzanowski_Marcin_M._The,
 author={Chrzanowski, Marcin M. and Buczek, Irmina and Musialik, Małgorzata and Ostrowska, Elżbieta Barbara},
 howpublished={online},
 publisher={Educational Research Institute},
 language={eng},
 title={The periodic table of elements in chemistry textbooks for junior high-schools},
 keywords={core curriculum, textbook, periodic table of elements, Mendeleev’s table, the 3rd stage of education (ISCED 2)},
}