Bibliography
There is a Google Scholar profile for the GAP system and some of its packages, where citations are added automatically as soon as they are detected by Google.
Another independent source of citations for GAP and packages is zbMATH. There is a dedicated page tracking GAP at zbMATH from which one can access a list of publications citing GAP.
We also used to produce our own bibliography of work involving and giving acknowledgement to GAP but this has not been maintained since 2022. You can still download the old .bib file here.
For quoting the use of GAP in your publications we provide standard forms for citing GAP 4.