TEA entsüklopeedia2011 https://www.ester.ee/record=b2666688*est

TEA entsüklopeedia2011 https://www.ester.ee/record=b2712813*est

TEA entsüklopeedia2012 https://www.ester.ee/record=b2869027*est

Thomas Johann Seebeck (1770-1831)2007 http://www.ester.ee/record=b2285820*est