Brasington, Bruce C. “Sine Testibus Tabulariis: A Late-Twelfth Century Civilian Notabilium in Memory of Professor Dr. Peter Landau”. Vergentis. Revista De Investigación De La Cátedra Internacional Conjunta Inocencio III, vol. 1, no. 11, Sept. 2020, pp. 61-74, https://vergentis.ucam.edu/index.php/vergentis/article/view/195.