European Commission. (1997). Council Regulation (EEC) No 2830/77 of 12 December 1977 on the measures necessary to achieve comparability between the accounting systems and annual accounts of railway undertakings: 11 languanges. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων.
Παραπομπή Chicago StyleEuropean Commission. Council Regulation (EEC) No 2830/77 of 12 December 1977 On the Measures Necessary to Achieve Comparability between the Accounting Systems and Annual Accounts of Railway Undertakings: 11 Languanges. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων, 1997.
Παραπομπή MLAEuropean Commission. Council Regulation (EEC) No 2830/77 of 12 December 1977 On the Measures Necessary to Achieve Comparability between the Accounting Systems and Annual Accounts of Railway Undertakings: 11 Languanges. Λουξεμβούργο: Υπηρεσία Επισήμων Εκδόσεων των Ευρωπαϊκών Κοινοτήτων, 1997.