TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Recommended practice for drill stem design and operating limits: API Recommended practice 7G
U1  - Caja 4 
PY  - 1998///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Equipos de perforación
KW  - Normalización
KW  - Normas API
ER  -