Bell, Adrian. "English Members of the Order of the Passion: Their Political, Diplomatic and Military Significance". In Philippe de Mézières and His Age, (Leiden, The Netherlands: Brill, 2012) doi: https://doi.org/10.1163/9789004211445_018 （页面存档备份，存于互联网档案馆） “whether his influence encouraged the involvement of an English force at the battle of Nicopolis in 1396”
Bell, Adrian. "English Members of the Order of the Passion: Their Political, Diplomatic and Military Significance". In Philippe de Mézières and His Age, (Leiden, The Netherlands: Brill, 2012) doi: https://doi.org/10.1163/9789004211445_018 （页面存档备份，存于互联网档案馆） “whether his influence encouraged the involvement of an English force at the battle of Nicopolis in 1396”
