His Community and society, c1988 CIP t.p. (Ferdinand Toennies)
Fundamental concepts of sociology, c1940 t.p. (Ferdinand Tönnies)
World biographical index 11, WWW, Aug. 1, 2003 (Tönnies, Ferdinand Julius, 1855-1936; philosopher)
His Koinotēta kai koinōnia, between 1960 and 1980? t.p. (Pherntinant Tainis)
Wikipedia, viewed 14 May 2013 Ferdinand Tönnies (26 July 1855, near Oldenswort, Eiderstedt, North Frisia, Schleswig – 9 April 1936, Kiel, Germany) was a German sociologist and philosopher. He was a major contributor to sociological theory and field studies, best known for his distinction between two types of social groups, Gemeinschaft and Gesellschaft. He was also a prolific writer and co-founder of the German Society for Sociology (of which he was president from 1909 to 1933, when he was ousted by the Nazis).