Downing, Douglas.
Statistics the easy way /
Douglas Downing, Jeffrey Clark 
. - 3rd edition 
. - [New York] : Barron's,  1997 
. - x, 394 p.  ill., tab.  27 cm. 
<br/><br/> У книзі штамп.
<br/><label>  ISBN: </label>0-8120-9392-5