Gjersø, Jonas Fossli (2015). Continuity of moral policy: a reconsideration of British motives for the partition of East Africa in light of anti-slave trade policy and imperial agency, 1878-96. PhD thesis, The London School of Economics and Political Science (LSE), p. 8http://etheses.lse.ac.uk/3202/.Manglende eller tom |tittel= (hjelp)
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transfermarkt.com, oppført som Willy Fossli †, Transfermarkt spiller-ID 326480, besøkt 9. oktober 2017[Hentet fra Wikidata]