OECD Tax Database – Figure V.1 compares average tax wedges and compulsory payment wedges for single taxpayers at average earnings without children in 2013]
"The 2013 Human Development Report – "The Rise of the South: Human Progress in a Diverse World"". HDRO (Human Development Report Office) United Nations Development Programme. pp. 144–147. Vaadatud 29.04.2014.