Shapiro, Carl. <br/><br/>
Information rules :  a strategic guide to the network economy / 
by Carl Shapiro, Hal R. Varian. 
 - Boston, Mass. :  Harvard Business School Press,  1999. 
 - x, 352 p. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/>The information economy--Pricing information--Versioning information. 
<br/><br/><label>ISBN: </label>087584863X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information technology--Economic aspects.<br/>Information society.