- Catholic Encyclopedia - St. Hyacinth, also known as the Apostle of the North, Polish Dominican, d. 1257.
www.newadvent.org/cathen/07591b.htm
- Catholic Online - Biographical portrait of St. Hyacinth.
saints.catholic.org/saints/hyacinth.html
- Patron Saints Index - Profile of St. Hyacinth, also known as St. Hyacinth of Cracow or the Apostle of Poland. Illustrated.
www.catholic-forum.com/saints/sainth06.htm
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