TY  - BOOK
AU  - Widdowson,R.W.
TI  - Towards holistic agriculture: a scientific approach 
SN  - 0080342116
PY  - 1987///
CY  - Oxford [Oxfordshire]
PB  - Pergamon Press
KW  - Organic farming
KW  - Agricultural ecology
KW  - Agriculture
ER  -