FC Basel 1893 (5 September 2001). "König leihweise zu Congeli" (in German). FC Basel 1893. Archived from the original on 2013-12-02. Retrieved 2001-09-05.{{cite web}}: CS1 maint: numeric names: authors list (link)
Weber, Dominik (15 October 2001). "König zurück zum FCB" (in German). FC Basel 1893. Archived from the original on 2013-06-16. Retrieved 2001-10-15.
swissinfo und Agenturen (23 July 2000). "Goalie König von GC zum FC Basel" [Goalie König from GC to FC Basel] (in German). swissinfo.ch. Retrieved 2022-11-16.
FC Basel 1893 (5 September 2001). "König leihweise zu Congeli" (in German). FC Basel 1893. Archived from the original on 2013-12-02. Retrieved 2001-09-05.{{cite web}}: CS1 maint: numeric names: authors list (link)