TY  - BOOK
AU  - Kamer J T A
AU  -  Desmit Jacob
TI  - Systems thinking :  concepts and nations
U1  - X:89M:(S), L7 
PY  - 1977///
CY  - Leiden
PB  - Martinus Nihoff Social Science Duivision   
KW  - ECONOMICS
ER  -