1. Atkinson, A., Bourguignon, F. (2015). Handbook of Income Distribution. Elsevier, North-Holland,.
2. Bellu, L. G., Liberati, P. (2006). Describing Income Inequality: Theil Index and Entropy Class Indexes. Food and Agriculture Organization of United Nations.
3. Council Directive (1989). The obligations of branches established in a Member State of credit institutions and financial institutions having their head offices outside that Member State regarding the publication of annual accounting documents