Gunter., Faure (2012). The Estonians : the long road to Independence. Mensing, Teresa.. London: Lulu.com. str. 145–146. ISBN978-1105530036. OCLC868958072.
Johnson, Jeff (2007). The new theatre of the Baltics : from Soviet to Western influence in Estonia, Latvia and Lithuania. Jefferson, N.C.: McFarland & Co. str. 93. ISBN9780786429929. OCLC76786725.