@incollection{sep-logic-epistemic,
    author       =  {Rendsvig, Rasmus and Symons, John},
    title        =  {Epistemic Logic},
    booktitle    =  {The Stanford Encyclopedia of Philosophy},
    editor       =  {Edward N. Zalta},
    howpublished =  {\url{https://plato.stanford.edu/archives/sum2019/entries/logic-epistemic/}},
    year         =  {2019},
    edition      =  {Summer 2019},
    publisher    =  {Metaphysics Research Lab, Stanford University}
}