Lumi, Ott (2014). «Comparative insight into the status of the lobbying regulation debate in Estonia». Journal of Public Affairs (på engelsk). 15 (3): 302. doi:10.1002/pa.1531.
Kalniņš, Valts (2017). «The world's smallest virtuous circle: Estonia». I Mungiu-Pippidi, Alina og Johnston, Michael. Transitions to Good Governance: Creating Virtuous Circles of Anticorruption (på engelsk). Cheltenham: Edward Elgar Publishing. s. 116. ISBN978-1-78643-915-4. doi:10.4337/9781786439154.00010.CS1-vedlikehold: Flere navn: redaktørliste (link)