Bibliography
J. P. Gumbert, Bat Books: A Catalogue of Folded Manuscripts Containing Almanacs or Other Texts (Turnhout, 2016).
C. Silva, 'Opening the Medieval Folding Almanac', in Exemplaria, 30:1 (2018), pp. 49-65.
R. Wieck, The Medieval Calendar: Locating Time in the Middle Ages (New York, 2017).
