Walker, Denise C. <br/><br/>
Mass notification and crisis communications :  planning, preparedness, and systems / 
Denise C. Walker 
 - Boca Raton, FL :  CRC Press,  c2012 
 - xxii, 528 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>1439874387 9781439874387 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Emergency management<br/>Emergency communication systems<br/>Risk communication<br/>Crisis management