Shoemaker, Pamela J. <br/><br/>
Gatekeeping theory / 
Pamela J. Shoemaker, Tim P. Vos 
 - New York :  Routledge,  2009 
 - 173 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references (p. [139]-164) and index 
<br/><br/><label>ISBN: </label>9780415981385 (hbk.) :  RM275.60 0415981387 (hbk.) 9780415981392 (pbk.) 0415981395 (pbk. ) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication--Philosophy