Coba jelasin Lihat pula dari Bolesław III dong

Sejarah Polandia di masa Wangsa Piast

Papal Bull Ex commisso nobis a Deo in: Codex diplomaticus majoris Polonia (in Latin), vol. 1, nr 7, [retrieved 28 July 2014].

Papal Bull Sacrosancta Romana in: Codex diplomaticus majoris Polonia (in Latin), vol. 1, nr 6, [retrieved 28 July 2014].

Gallus Anonymous: Kronika polska (in Polish) , Wrocław 2003, [retrieved 28 July 2014].

Jan Długosz: Jana Długosza kanonika krakowskiego Dziejów polskich ksiąg dwanaście (in Polish) , vol. I, Kraków 1867, [retrieved 28 July 2014].

G. H. Pertz: Annales Magdeburgenses (Monumenta Germaniae Historica) (Monumenta Germaniae Historica) (in Latin) , vol. XVI, Hannover 1859, [retrieved 1 July 2011].

G. H. Pertz: Annalista Saxo w: Chronica et annales aevi Salici (Monumenta Germaniae Historica) (in Latin) , vol. VI, Hannover 1844, [retrieved 28 July 2014].

Collective work: Monumenta Poloniae Historica (in Polish) (Polish historical monuments), vol. III, Lwów 1878, [retrieved 28 July 2014].