Références
De EverybodyWiki Bios & Wiki
- "Cameroon: Three clubs on the roll for Joseph and Joseph's brief football path". Africa top sports. 18 September 2018.
- "Drömmen om att bli fotbollsagent – inte längre bara en dröm" (in Deutsch). Magazin24. 15 July 2015.
- "Former Auxerre footballer at a test in Vitez". Sportske. 11 May 2017.