TY  - RPRT
TI  - A constructivist approach to concept attainment.
AU  - A Kinghorn
PY  - 1991
DO  - 10.1016/0260-6917(91)90095-r
UR  - https://pubmed.ncbi.nlm.nih.gov/1881381/
ID  - 1881381
ER  -