@misc{General_Diet_(Seym)_64.,
 author={General Diet (Seym)},
 copyright={Wydawnictwo Sejmowe, Warszawa},
 howpublished={online},
 publisher={Wydawnictwo Sejmowe, Warszawa},
 title={64. General Diet in Piotrków 1558-59},
 keywords={Legislation of the Diet},
}