TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Recommended practice for installation, maintenance, and lubrication of pumping units: API Recommended practice 11G
U1  - Caja 7-A 
PY  - 2013///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Unidades de bombeo
KW  - Normalización
KW  - Normas API
ER  -