TY  - GEN
AU  - Swaan,A.de
TI  - Human societies: an introduction 
SN  - 0745625916 (hard : alk. paper)
AV  - HM701 
PY  - 2001///
CY  - Cambridge, UK : Malden, MA
PB  - Polity ; Blackwell
KW  - Social systems
KW  - Social interaction
N1  - Includes bibliographical references (p. 152-156) and index
ER  -