[1] K. Conrad, Supgroup series II, Lecture Notes available at https://kconrad.math.uconn.edu/blurbs/grouptheory/subgpseries2.pdf.
[2] The GAP Group, GAP – Groups, Algorithms, and Programming, Version 4.12.2 ; 2022, https://www.gap-system.org.
[3] D. Gorenstein, Finite groups, AMS Chelsea Publishing, New York, 1968.
[4] D. J. S. Robinson, A course in the theory of groups, 2nd Edition, Graduate Text in Mathematics, Springer, New York, 1996.
[5] M. Suzuki, Group theory I, Springer Berlin, Heidelberg, 1982.