TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Recommended practice for occupational safety for oil and gas well drilling and servicing operations: API recommended practice 54
U1  - Caja 11-A 
PY  - 1999///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normas API
KW  - Normalización
ER  -