Shapiro, Carl. Information rules : a strategic guide to the network economy / Carl Shapiro, Hal R. Varian. - Boston, Mass. : Harvard Business School Press, 1999. - x, 352 p. : ill. ; 25 cm. Includes bibliographical references and index. ISBN: 087584863X (alk. paper) Subjects--Topical Terms: Information technology--Economic aspects LC Class. No.: HC79.I55