AU  - Shelley, Fred M. 
ED  - University of Southern California 
TI  - Structure, stability and section in American politics 
CY  - s.l: 
PB  - Butterworth & Co 
KW  - HISTORIA POLITICA
KW  - GEOGRAFIA POLITICA
KW  - CULTURA POLITICA
KW  - TEORIA
KW  - ESTADOS UNIDOS
ER  -