Kummerling, A., Lehndorff, S., & European Foundation for the improvement of living and working conditions. (2007). Extended and unusual working hours in European companies: Establishment Survey on Working Time 2004-2005. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων.
Παραπομπή Chicago StyleKummerling, Angelika., Steffen Lehndorff, and European Foundation for the improvement of living and working conditions. Extended and Unusual Working Hours in European Companies: Establishment Survey On Working Time 2004-2005. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων, 2007.
Παραπομπή MLAKummerling, Angelika., Steffen Lehndorff, and European Foundation for the improvement of living and working conditions. Extended and Unusual Working Hours in European Companies: Establishment Survey On Working Time 2004-2005. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων, 2007.