Land and the National Question in Ireland, 1858-82. Gill & Macmillan, Dublin 1979, ISBN 0-7171-0820-1.
The Making and Remaking of the Good Friday Agreement. The Liffey Press, Dublin 2007, ISBN 978-1-905785-17-9.
Northern Ireland. A Chronology of the Troubles, 1968-99. Gill & Macmillan, London 1999, ISBN 0-7171-2828-8 (zusammen mit Gordon Gillespie).
Northern Ireland 1921-2001. Political Power and Social Classes. Serif Books, London 2002, ISBN 1-89795-938-9 (zusammen mit Peter Gibbon und Henry Patterson).
Seán Lemass and the Making of Modern Ireland, 1945-66. Gill & Macmillan, Dublin 1982, ISBN 0-7171-1260-8 (zusammen mit Henry Patterson)
The State in Northern Ireland, 1921-72. Political Forces and Social Class. Manchester University Press, Manchester 1979, ISBN 0-7190-0744-5.