TY  - BOOK
AU  - Sim,Julius
AU  - Wright,Chris
TI  - Research in health care: concepts, designs and methods 
SN  - 0748737189
PY  - 2000///
CY  - Cheltenham
PB  - Nelson Thornes
KW  - Health Services Research
KW  - Research design
N1  - References : p. 361-389
ER  -