St. Peter Canisius
- Biography by Terry Matz paints the saint as a "secret agent" of the Vatican. With prayer.
- http://www.catholic.org/saints/saint.php?saint_id=93

Peter Canisius (Kanis), SJ, Priest Doctor
- Biographical essay on this saint, canonized in 1925.
- http://www.saintpatrickdc.org/ss/1221.htm#pete

Militantis Ecclesiae
- Encyclical of Pope Leo XIII, on St. Peter Canisius.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_01081897_militantis-ecclesiae_en.html

Blessed Peter Canisius
- Long essay in the Catholic Encyclopedia on Peter Canisius, sometimes called Kannees, Kanys, or possibly De Hondt. Dutch Jesuit priest, d. 1597.
- http://www.newadvent.org/cathen/11756c.htm

St. Peter Canisius (1520-1597)
- From the book "The Saints: A Concise Biographical Dictionary."
- http://www.cin.org/saints/petcanis.html

Peter Canisius, Saint
- Brief entry in the Columbia Encyclopedia.
- http://www.bartleby.com/65/pe/PeterCan.html

Peter Canisius
- Baptismal name: Peter Kanis. Also dubbed "the Hammer of Protestantism" and the "Second Apostle of Germany." Illustrated profile, with an excerpt from the saint's writings.
- http://www.catholic-forum.com/saints/saintp08.htm