16Coyne, Frank. Islands in the Clouds: An Upland Archaeological Study on Mount Brandon and The Paps, County Kerry. Tralee, Co. Kerry: Kerry County Council in Association with Aegis Archaeology Limited, 2006. 46-50. This book may be read in its entirety here.
In comparing The City to the Ballynahatty Giant's Ring, the author states, "Perhaps a similar sequence may be suggested for 'The City'- the megalithic structure/tomb enclosed in the Late Neolithic/Early Bronze Age, and this enclosure substantially remodeled, adapted and added to as the ritual and ceremonial needs of the society itself evolved and changed over time."