O'Connor, P. (2008) 'HFACS with an additional level of granularity: validity and utility in accident analysis'. Aviation, Space And Environmental Medicine, 79 :599-606.
O'Connor, P. & O'Dea, A. (2007) 'The U.S. Navy's aviation safety program: a critical review'. International Journal Of Applied Aviation Studies, 7 (2):312-328.