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Dietrich, Heiko; Eick, Bettina; Feichtenschlager, Dörte (2008), "Investigating p-groups by coclass with GAP", Computational group theory and the theory of groups, Contemporary Mathematics, vol. 470, Providence, RI: American Mathematical Society, pp. 45–61, doi:10.1090/conm/470/09185, ISBN9780821843659, MR2478413
Leedham-Green, C. R.; Newman, M. F. (1980). "Space groups and groups of prime power order I". Arch. Math. 35: 193–203. doi:10.1007/bf01235338. S2CID121022964.