Welch, Patrick J. <br/><br/>
Economics : theory and practic 
/ Patrick J. Welch, Gerry F. Welch 
. - 8th ed. 
. - Hoboken  : John Wiley & Sons, cop. 2007
. - XX - 537 p.  : ill. couv. ill. en coul.  ; 25 cm. 
<br/><br/>Index.- 
<br/><br/><label>ISBN: </label>978-0471-67946-2 ISBN 0-471-67946-1 
<br/><br/><label>Universal Decimal Class. No.: </label>330