Jean W. Sedlar.[1] = East Central Europe in the Middle Ages, 1000–1500. — University of Washington Press, 1994. — Т. 3. — С. 388. — (History of East Central Europe). — ISBN 0295972904.(англ.)
Daniel Stone.[2] = The Polish–Lithuanian State, 1386–1795. — University of Washington Press. — 2001. — С. 10–11. — (A History of East Central Europe). — ISBN 0-295-98093-1.(англ.)
Jerzy Lukowski, Hubert Zawadzki.[3] = A Concise History of Poland. — Cambridge University Press, 2006. — С. 44. — ISBN 052185332X.(англ.)
