1. E.F. Assmus Jr., J.D. Key, Designs and their Codes, Cambridge Tracts in Mathematics, vol. 103, Cambridge University Press, Cambridge, 1992 (Second printing with corrections, 1993).
2. W. Bosma, J. Cannon, Handbook of Magma Functions, Department of Mathematics, University of Sydney, November 1994.
3. A global code invariant under the Higman–Sims group;Calderbank;J. Algebra,1982
4. Atlas of Finite Groups;Conway,1985
5. The Maximal Subgroups of Conway's Group Co3 and McLauglin's Group;Finkelestein;J. Algebra,1973