Isard, Walter. Introduction to regional science / Walter Isard. - Englewood Cliffs, N.J. : Prentice-Hall, c1975 - xxii, 506 p. : ill. ; 24 cm. Includes bibliographical references and index. ISBN: 0134938410 Subjects--Topical Terms: Regional planning. Dewey Class. No.: 309.25 / ISI