TY  - BOOK
AU  - Swaan,Abram de
TI  - Human societies: an introduction 
SN  - 0745625916
U1  - 301 21
PY  - 2001///
CY  - Cambridge
PB  - Polity
KW  - Social systems
KW  - Social interaction
N1  - Includes bibliographical references and index
ER  -