Mai 1977 zur Harmonisierung der Rechtsvorschriften der Mitgliedstaaten über die Umsatzsteuern - Gemeinsames Mehrwertsteuersystem: einheitliche steuerpflichtige Bemessungsgrundlage.  
The own resources accruing from value added tax shall be calculated and checked as if the Canary Islands and Ceuta and Melilla were included in the territorial field of application of Sixth Council Directive 77/388/EEC of 17 May 1977 on the harmonisation of the laws of the Member States relating to turnover taxes - Common system of value added tax: uniform basis of assessment.  