Ellis, Robert Sidney. <br/><br/>
The psychology of individual differences / 
by Robert Sidney Ellis. 
 - New York :  D. Appleton and Company,  1928. 
 - xxiii, 533 p. :  ill. ;  21 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label> Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Individuality.<br/>Psychophysiology.<br/>Ability.