TY  - GEN
AU  - HEIDBREDER,E
TI  - The attainment of concepts; the problem
SN  - 0022-1309
PY  - 2010///0318
KW  - Humans
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1080/00221309.1946.10544557
ER  -