Exemplo:
[#] Parameter Values for Ultra-High Definition Television Systems for Switzerland, Production and International Programme Exchange, Rec. ITU-R BT.2020-2, International Telecommunications Union, Ginebra, Suiza, Oct. 2015.
Exemplo:
[#] Frequency Response and Bias, NERC Reliability Standard BAL-003-0.1b, Maio 2009. [En liña]. Dispoñible en: http://www.nerc.com/files/BAL-003-0_1b.pdf