Hartley, Alick. <br/><br/>
Additional statistics / 
A. Hartley. 
 - Newtown :  Gwelfryn,  1991. 
 - 235 p. ;  22 cm. 
<br/><br/><label>ISBN: </label>0951323369 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics--Study and teaching (Secondary).<br/>Statistics--Problems, exercises, etc.