Young, Alison, A D Lacaille, and Frederick E Zeuner. 1943. “Report on Standing Stones and Other Remains Near Fowlis Wester, Perthshire: With a Report on the Quartzes and a Report on Samples of Soil from the East Circle”. Proceedings of the Society of Antiquaries of Scotland 77 (November):174-84. https://doi.org/10.9750/PSAS.077.174.184.