https://www.vatican.va/content/john-paul-ii/pt/encyclicals/documents/hf_jp-ii_enc_19850602_slavorum-apostoli.html
Slavorum Apostoli (2 de junho de 1985)
apostolidejunho
https://www.wbc.poznan.pl/dlibra/publication/493911
Chronica Slavorum seu Annales Helmoldi [...] hisque subiectum [...] supplementum Arnoldi abbatis...
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chronicaseuannalessupplementumarnoldi
https://books.google.co.uk/books?id=hDI8ETGnVPAC
Monumenta spectantia historiam Slavorum meridionalium: Documenta historiae ... - Franjo Racki,...
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