000
002440000a22001090004500
245
_a
Systems thinking
100
_a
Emery, F.E., ed.
260
_a
Middlesex
_b
Penguin Education
_c
1981
080
_a
65.012.2
_b
E5
041
_a
EN
942
_c
BK
999
_c
117055
_d
117055