Schumacher, L. (2021). Early Thirteenth-Century English Franciscan Thought. De Gruyter.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchumacher, Lydia. Early Thirteenth-Century English Franciscan Thought. Berlin/Boston: De Gruyter, 2021.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSchumacher, Lydia. Early Thirteenth-Century English Franciscan Thought. De Gruyter, 2021.
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