Walker, Denise C <br/><br/>
Mass notification and crisis communications:  planning, preparedness, and systems 
by Denise C. Walker 
 - Boca Raton:  CRC Press,  2012 
 - xxii, 528p. 
<br/><br/><label>ISBN: </label>9781439874387 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Emergency management.<br/>Crisis management.<br/>Emergency communication systems