Rolph, Elizabeth S <br/><br/>
Introducing the preferred provider organization option into health benefit plans :  three case studies / 
Elizabeth Rolph, ; Supported by the U.S. Department of Health and Human Services. 
 - California :  Rand Corporation,  1990 
 - xix, 157 p. ;  28 cm 
 - A Rand note ;  N-2958-HHS .
 - Rand note ;  N-2958-HHS .
<br/><br/><label>ISBN: </label> Hadiah