Vis et metus, or How the Monastic Chronicler Ludolf of Sagan Presented the Relationships of Canons Regular with Local Dukes (14th Century) - Filipek, Aleksandra (. Ecclesia et violentia. - Newcastle upon Tyne : Cambridge Scholars Publishing, 2014. - xii, 360 pages. - ISBN 1-4438-6659-8, 2014)