TY  - BOOK
AU  - Maas,Peter
TI  - Underboss: Sammy the Bull Gravano's story of life in the Mafia 
PY  - 1997///
CY  - London
PB  - HarperCollins
KW  - Gravano, Salvatore,
KW  - Gotti, John.
KW  - Mafia
KW  - United States
KW  - Biography
KW  - New York (State)
KW  - Organized crime
ER  -