TY  - BOOK
AU  - Donner, Allan
AU  - Neil, Klar
TI  - Design & Analysis of Cluster Randomization Trials in Health Research 
SN  - 9780470711002
U1  - 610.72 
PY  - 2000///
CY  - UK
PB  - John Wiley 
KW  - Group-randomized trials
N1  - Includes Index
ER  -