TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Specification for subsurface sucker rod pump assemblies, components, and fittings: API Specification 11AX
U1  - Caja 7 
PY  - 2015///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Varillas de bombeo
KW  - Normalización
KW  - Normas API
ER  -