A Developmental Study Of The Child'S Ability Of Abstraction In Verbal Thinking : I On The Functional Levels Of Abstraction-

Shinomiya, A. (1967). A Developmental Study Of The Child’S Ability Of Abstraction In Verbal Thinking : I On The Functional Levels Of Abstraction-. The Japanese Journal of Educational Psychology, 15(3), 145–160190. https://doi.org/10.5926/jjep1953.15.3_145