Introduction to statistical methods 
By C.B. Gupta 
 - 9th rev. ed. 
 - New Delhi:  Vikas,  1981. 
<br/><br/><label>ISBN: </label>0706915496 
<br/><br/><label>Subjects--Index Terms: </label>Probabilities & applied mathematics Statistics 
<br/><br/><label>Dewey Class. No.: </label>519.5