Gardener, Mark. <br/><br/>
The Essential r reference / 
Mark Gardener. 
 - 1st ed. 
 - New Delhi, IN :  Wiley Pub., Inc.,  2013. 
 - xxi,554.p; 
<br/><br/><label>ISBN: </label>9781118391419 (pbk. : alk. paper) 9788126546015 
<br/><br/><label>Dewey Class. No.: </label>004.657  / GAR