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Sir Gawain and the Green Knight
The great Middle English Arthurian romance, preserved in a single manuscript (British Library, Cotton Nero A.x). Its long description of Gawain's shield explains the pentangle as an endless knot of five fives, the fullest medieval Christian interpretation of the pentagram.
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The Art and Logic of Ramon LlullAnthony Bonner Athanasius KircherPaula Findlen (ed.) Athanasius Kircher's Theatre of the WorldJoscelyn Godwin A Beginner's Guide to Constructing the UniverseMichael S. Schneider Biblical NumerologyJohn J. Davis The Black Books 1913–1932C. G. Jung The Black Books 1913–1932C. G. Jung The Book of BeastsT. H. White The Book of KellsBernard Meehan