TY  - RPRT
TI  - Survey data collection: operationalizing the research design.
AU  - E Hildebrandt
PY  - 1996
DO  - 10.1111/j.1525-1446.1996.tb00231.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8936247/
ID  - 8936247
ER  -