Malakhov, Evgeniy. “Revival of the Traditions of the Estonians in the Southern Lands of Russia in the 19th Century”. Gosudarstvennaya Sluzhba, vol. 17, no. 5, Sept. 2015, pp. 105-7, https://gosudarstvennaya-sluzhba.owebs.ru/article/view/22155.