O'Hagan, Timothy (2019) Rousseau's Responses to Human Progress. In: The Rousseauian Mind. Routledge Philosophical Minds . Routledge. ISBN 9781138205314
O'Hagan, Timothy (2015) Freedom: Political. In: International Encyclopedia of the Social & Behavioral Sciences. Elsevier, pp. 398-403. ISBN 9780080970875
O'Hagan, Tim (2006) Citizen of the world: Reason in the work of Martin Hollis. Ratio, 19 (3). pp. 364-369. ISSN 1467-9329
O'Hagan, Timothy (2006) L'amour-propre est un instrument utile mais dangereux: Jean-Jacques Roussean et Port-Royal. Revue de Théologie et de Philosphie, 138 (1). pp. 29-37.
O'Hagan, Tim (2004) Taking Rousseau seriously. History of Political Thought, 25 (1). pp. 73-85.
O'Hagan, Tim (2003) Rousseau (Arguments of the Philosophers). Routledge. ISBN 0-415-30863-1
O'Hagan, Tim (2001) Hollis, Rousseau and Gyges' ring. Critical Review of International Social & Political Philosophy, 4 (4). pp. 55-68. ISSN 1743-8772
O'Hagan, Tim (2001) The alarming task of understanding Being and Time. International Studies in Philosophy. pp. 131-137.
O'Hagan, Tim and Dent, N J H (1998) Rousseau on amour-propre. Proceedings of the Aristotelian Society, 72 (1). pp. 57-74. ISSN 1467-9264