• Geotourism highlights of the Estonian small islands2010 https://www.ester.ee/record=b2645242*est
• Geotourism highlights of the Saaremaa and Hiiumaa islandsRaukas, Anto; Bauert, Heikki; Willman, Sebastian; Puurmann, Elle; Ratas, Urve2009 https://www.ester.ee/record=b2529506*est