@Book chapter{b1000002870693,
	author =  "Jelonek-Litewka, Krystyna", 
	title = "Czas powstania rękopisu "Liber beneficiorum" Jana Długosza na podstawie znaków wodnych = Dating the origin of Jan Długosz's "Liber beneficiorum" based on watermarks ",
	publisher = "",
    year =      ""
}