Book Gardner, Martin (1996)
The universe in a handkerchief: Lewis Carroll's mathematical recreations, games, puzzles, and word plays. (/isis/citation/CBB000067790/) unapi

Chapter Boockmann, Friederike (1994)
Das Josephsspiel: Einkleidungsformen und neue Textfunde aus Handschriften. In: Cosmographica et Geographica: Festschrift für Heribert M. Nobis zum 70. Geburtstag (p. 195). (/isis/citation/CBB000072949/) unapi

Article Schreiber, Peter (1993)
A note on the cattle problem of Archimedes. Historia Mathematica (pp. 304-306). (/isis/citation/CBB000065770/) unapi

Chapter Folkerts, Menso (1993)
Die Alkuin zugeschriebenen Propositiones ad acuendos iuvenes. In: Science in western and eastern civilization in Carolingian times (p. 273). (/isis/citation/CBB000050218/) unapi

Chapter Breidert, Wolfgang (1992)
Arithmomachia. In: Quadrivium: Musique et sciences (p. 169). (/isis/citation/CBB000048175/) unapi

Book Braekman, W. L. (1985)
Een Nederlands raadselboek uit de zestiende eeuw. (A Dutch riddle-book of the 16th century.). (/isis/citation/CBB000009925/) unapi

Book Alberti, Leon Battista (1980)
Ludi matematici. A cura di Rinaldi, Raffaele. Con una prefazione di Ludovico Geymonat. (/isis/citation/CBB000015362/) unapi

Article Campbell, Paul J. (1977)
Gauss and the eight queens problem: A study in miniature of the propagation of historical error. Historia Mathematica (pp. 397-404). (/isis/citation/CBB000021522/) unapi