Roman Senkus (Managing Editor) (2001-XX-YY). "Roman Mstyslavych [Mstyslavyč] (Romanko)". Encyclopedia of Ukraine. Canadian Institute of Ukrainian Studies. Diakses tanggal 2009-12-26.Periksa nilai tanggal di: |date= (bantuan)
Roman Senkus (Managing Editor) (2001-XX-YY). "Romanovych dynasty [Romanovyč]". Encyclopedia of Ukraine. Canadian Institute of Ukrainian Studies. Diakses tanggal 2009-12-26.Periksa nilai tanggal di: |date= (bantuan)