Crane, Diana Invisible colleges; diffusion of knowledge in scientific communities. - Chicago University of Chicago Press [1972] - x, 213 p. illus. 23 cm. Bibliography: p. 195-206. ISBN: 0226118576 LCCN: 77182088 Subjects--Topical Terms: Science--Social aspects. LC Class. No.: Q175.5 / .C7 Dewey Class. No.: 301.5