1927-10-03: Celtic 4-1 Cardiff City, Friendly – The Celtic Wiki

Belfast Celtic – The Celtic Wiki

The Celtic Wiki – A comprehensive guide to Celtic FC, a football team based in Glasgow, Scotland.

1927-10-03: Celtic 4-1 Cardiff City, Friendly – The Celtic Wiki

Belfast Celtic – The Celtic Wiki

Celtic F.C., Football Wiki

Cardiff RFC - Wikipedia

Celtic F.C. in European football - Wikipedia

Celtic F.C. in European football - Wikipedia

History of Celtic F.C. (1887–1994) - Wikipedia

1974-04-10: Celtic 0-0 Athletico Madrid, European Cup – The Celtic Wiki

Celtic badge – The Celtic Wiki

Celtic Park – From The Graveyard to Paradise (from Jungle Bhoys Fanzine (2010) – The Celtic Wiki

Celtic F.C., Football Wiki