Leber, U., Wagner, A., & European Foundation for the improvement of living and working conditions. (2007). Early and phased retirement in European companies: Establishment survey on working time 2004-2005. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων.
Παραπομπή Chicago StyleLeber, Ute., Alexandra Wagner, and European Foundation for the improvement of living and working conditions. Early and Phased Retirement in European Companies: Establishment Survey On Working Time 2004-2005. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων, 2007.
Παραπομπή MLALeber, Ute., Alexandra Wagner, and European Foundation for the improvement of living and working conditions. Early and Phased Retirement in European Companies: Establishment Survey On Working Time 2004-2005. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων, 2007.