TY  - BOOK
AU  - Graubard,stephen
TI  - The presidents: the transformation of the american presidency from  Theodore roosevelt to barack Obama.   
SN  - 9780141042459
AV  - G774p 2011
PY  - 2011///
CY  - London
PB  - Penguin Books
KW  - Presidents
KW  - United States
KW  - History
KW  - 20th century
KW  - Executive power
KW  - Political leadership
KW  - Presidentes
KW  - Estados Unidos
KW  - Historia
KW  - Poder ejecutivo
KW  - iderazgo político
ER  -