TY  - GEN
TY  - GEN
T1  - System and structure : essays in communication and exchange
A1  - Wilden, Anthony
LA  - eng
PP  - London,
YR  - 1977
UL  - https://kansalliskirjasto.finna.fi/Record/fikka.166271
OP  - 540
SN  - 0-422-76210-5
ER  -