@misc{Infeld_Eric_[List,
 author={Infeld, Eric},
 howpublished={online},
 language={eng},
 type={rękopis},
 title={[List Erica Infelda do Jerzego Borejszy].},
 keywords={Borejsza, Jerzy (1905-1952), listy, rękopisy, 20 w.},
}