Ahmavaara, Yrjö <br/><br/>
Transformation Analysis of Factorial Data and Other New Analytical Methods of Differential Paychology with Their Application to Thurstone's Basic Studies 

 - Helsinki :   Pekka Katara,   1954. 
 - 149 p. :   gráficos ;   18 cm. 
 - Annales Academiae Scientiarum Fennicae ;   T.88, 2 .