Lehtovaara, Arvo <br/><br/>
School-Age Reading Interest: A Methodological Approach 

 - Helsinki :   Suomalainen Tiedeakatemia,   1964. 
 - 216 p. ;   22 cm. 
 - Annales Academiae Scientiarum Fennicae. Ser. B. ;   Tomo 131, 2 .