Watts, Duncan J., 1971- Six degrees : the new science of networks / Duncan J. Watts. - London : Vintage Books, 2004. - 368 p. ; 20cm. Originally published: London: Heinemann, 2003. ISBN: 9780099444961 (pbk) Subjects--Topical Terms: Science--Philosophy.System theory. Dewey Class. No.: 500.2 / WAT