Ellickson, Phyllis L.,  1942- <br/><br/>
An assessment of active versus passive methods for obtaining parental consent / 
Phyllis L. Ellickson and Jennifer A. Hawes-Dawson. ; prepared for the Conrad N. Hilton Foundation. 
 - California :  Rand Corporation,  1989 
 - 11 p. ;  28 cm. 
 - A Rand Note ;  N-2935-CHF .
 - Rand Note ;  N-2935-CHF. .
<br/><br/><label>ISBN: </label> Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mail surveys--Response rate<br/>Behavioral assessment<br/>High school students--Drug testing