Members of Siuru group, rear: Peet Aren, Otto Krusten; front row: Friedebert Tuglas, Arthur Adson, Marie Under, August Gailit, Johannes Semper and Henrik Visnapuu
^Jean Albert Bédé, William Benbow Edgerton, Columbia Dictionary of Modern European Literature, Columbia University Press, 1980, ISBN0-231-03717-1, p237
^Rubulis, Aleksis. Baltic Literature. University of Notre Dame Press,1970.