Simons2020
Simons, Peter, "Stanisław Leśniewski", The Stanford Encyclopedia of Philosophy (Fall 2020 Edition), Edward N. Zalta (ed.), URL = <https://plato.stanford.edu/archives/fall2020/entries/lesniewski/>.
Simons, Peter, "Stanisław Leśniewski", The Stanford Encyclopedia of Philosophy (Fall 2020 Edition), Edward N. Zalta (ed.), URL = <https://plato.stanford.edu/archives/fall2020/entries/lesniewski/>.