TY  - BOOK
AU  - Lenski, Gerhard
TI  - Human societies: an introduction to mascrosociology. (3rd ed.)
SN  - 0070371741
AV  - HM 51 Len 
PY  - 1978///
CY  - New York
PB  - MacGraw-Hill
KW  - SOCIAL EVOLUTION
KW  - Macrosociology
ER  -