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• Milli Tanara Ubertazzi, Natura d’Europa, Novara, Instituto Geografico de Agostini, 2002.
• Georg Ulmer, Unsere Wasserinsekten, Leipzig, Quelle & Mener, (1911), 1928.
• Ernest E. Unwin, Pond problems, The Cambridge nature study series, Cambridge University Press, (1914), 1934, pp. 49-50.
• Laurence Urdang (dir.), The Random House College Dictionnary revised Edition, New York, 1988.
• Jim Ure, Bait for trout, being the confessions of an unorthodox angler, Chicago, Henry Regnery compazny, 1973, p. 73.
• F.A. Urquhart, Introducing the Insect, Ill. E.B.S. Logier, London, Frederick Warne, 1965.
• Robert Leslie Usinger, The life of rivers and streams. The World Book Encyclopedia. New York,  MacGraw Hil Book Company, 1967.