1. Richard Austin, Impartial and Partisan Games, M.Sc. thesis, University of Calgary, 1976.
2. W. W. Rouse Ball und H. S. M. Coxeter, „Mathematical Recreations & Essays“, 12. Aufl., University of Toronto ress, 1974 (insbesondere S. 38–39).
3. E. R. Berlekamp, Unsolved problem #4, in W. T. Tutte (Hrsg.) „Recent Progress in Combinatorics“, Academic Press, New York und London, 1969, S. 342–343.
4. E. R. Berlekamp, Some recent results on the combinatorial game called Welter’s Nim, Proc. 6th Conf. Information Sci. and Systems, Princeton, 1972, 203–204.
5. F. de Carteblanche, The princess and the roses, J. Recreational Math. 3 (1970) 238–239.