Vir - besedilo: 31977L0313 Direktiva Sveta z dne 5. aprila 1977 o približevanju zakonodaje držav članic, ki se nanaša na merilne sisteme za tekočine razen vode
Vir - besedilo: 31977L0313 Council Directive 77/313/EEC of 5 April 1977 on the approximation of the laws of the Member States relating to measuring systems for liquids other than water, 1.1.4.