O'Shea, James (2011) Sums of Squares in Certain Quaternion and Octonion Algebras. Comptes Rendus Mathematique, 349 (5-6). pp. 239-242. ISSN 1631-073X
O'Shea, James (1998) The Web of Addiction An Exploration of the Complex Physiological, Psychological, Social and Political Forces Involved in the Development of Addictive Behaviours. Masters thesis, National University of Ireland Maynooth.