Hitchens, D. M. W. N., Wagner, K., & Birnie, J. E. (1990). Closing the productivity gap: A comparison of Northern Ireland, the Republic of Ireland, Brita in and West Germany. Avebury.
Chicago-Zitierstil (17. Ausg.)Hitchens, David M. W. N., Karin Wagner, und John E. Birnie. Closing the Productivity Gap: A Comparison of Northern Ireland, the Republic of Ireland, Brita in and West Germany. Aldershot u.a: Avebury, 1990.
MLA-Zitierstil (9. Ausg.)Hitchens, David M. W. N., et al. Closing the Productivity Gap: A Comparison of Northern Ireland, the Republic of Ireland, Brita in and West Germany. Avebury, 1990.
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