TY  - BOOK
AU  - Werner,Jargen
TI  - Participitary development of agricultural innovations : Procedures and methods of on -farm research
SN  - 3 88085 492 0
U1  - 630 .72 
PY  - 1993///
CY  - Germany
PB  - GTZ
KW  - Communication
KW  - data collection
ER  -