TY  - RPRT
TI  - The problem of goal changes.
AU  - B Bullough
AU  - V Bullough
PY  - 1965
DO  - 10.1111/j.1744-6198.1965.tb00299.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5173804/
ID  - 5173804
ER  -