TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Specification on end closures, connectors and swivels: API Specification 6H
U1  - Caja 3-2 
PY  - 1998///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Cabeza de pozos
KW  - Normalización
KW  - Normas API
ER  -