1. Babici, G., Crivelli, E. & Marinkov, M. (2018). Romania: Selected issues (Country Report No. 18/149). Washington, DC: International Monetary Fund. Retrieved from http://www.imf.org/en/Publications/CR/Issues/2018/06/06/Romania-Selected-Issues-45944
2. Fighting Income Tax Evasion with Positive Rewards
3. BBC News. (2015, September 28). Poland: 'receipt lottery' launched to boost VAT income. BBC News. Retrieved from http://www.bbc.co.uk/news/blogs-news-from-elsewhere-34379634
4. Rewarding tax compliance: taxpayers' attitudes and beliefs
5. Borstnik, M. (2016.). Slovenia: Fiscal receipt lottery starts in 2016. Retrieved from http://www.salesdatacontroller.com/5087-2/