Sharples, N. M.; Barlow, A.; Birkett, D. A.; Clarke, A.; Clarke, A. S.; MacCormick, F.; Stenhouse, M. J.; Swinney, G.; Wickham-Jones, C. R.; Yarrington, C. H. Excavations at Pierowall Quarry, Westray, Orkney. PSAS 1985, 114, 75-125.