Hitchens, D. M., Wagner, K., & Birnie, J. E. (1990). Closing the productivity gap: A comparison of Northern Ireland, the Republic of Ireland, Britain and West Germany. Avebury.
Chicago-Zitierstil (17. Ausg.)Hitchens, David M., Karin Wagner, und J. E. Birnie. Closing the Productivity Gap: A Comparison of Northern Ireland, the Republic of Ireland, Britain and West Germany. Aldershot [u.a.]: Avebury, 1990.
MLA-Zitierstil (9. Ausg.)Hitchens, David M., et al. Closing the Productivity Gap: A Comparison of Northern Ireland, the Republic of Ireland, Britain and West Germany. Avebury, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.