Kerov, V. L. (2007). Franciskancy vo Francii v XIII - pervoj polovine XIV v: Petr Ioann Olivi i spiritualy = Franciscans in France in the 13th century and the 14th century first half. Ėkon-Inform.
Chicago Style (17th ed.) CitationKerov, Vsevolod Lʹvovič. Franciskancy Vo Francii V XIII - Pervoj Polovine XIV V: Petr Ioann Olivi I Spiritualy = Franciscans in France in the 13th Century and the 14th Century First Half. Moskva: Ėkon-Inform, 2007.
MLA (8th ed.) CitationKerov, Vsevolod Lʹvovič. Franciskancy Vo Francii V XIII - Pervoj Polovine XIV V: Petr Ioann Olivi I Spiritualy = Franciscans in France in the 13th Century and the 14th Century First Half. Ėkon-Inform, 2007.
Warning: These citations may not always be 100% accurate.