The early stadium at Isthmia and the founding of the Isthmian Games - Gebhard, E.R (Πρακτικά συμπoσίoυ Oλυμπιακών Aγώνων, [Aθήνα] 5 - 9 Σεπτεμβρίoυ 1988. Proceedings of an international symposium on the Olympic Games, [Athens] 5 - 9 September 1988)