TEA entsüklopeedia
2011
https://www.ester.ee/record=b2666688*est
TEA entsüklopeedia
2011
https://www.ester.ee/record=b2712813*est
TEA entsüklopeedia
2012
https://www.ester.ee/record=b2869027*est
Thomas Johann Seebeck (1770-1831)
2007
http://www.ester.ee/record=b2285820*est