@misc{Heyck_Eduard_(1862-1941)_Der,
 author={Heyck, Eduard (1862-1941)},
 address={Bielefeld},
 address={Leipzig},
 howpublished={online},
 publisher={Delhagen & Klasing},
 publisher={Fischer & Wittig},
 language={ger},
 type={książka},
 title={Der Grosse Kurfürst},
 keywords={Fryderyk Wilhelm (elektor brandenburski ; 1620-1688), Brandenburgia (Niemcy) -- 17 w},
}