TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Recommended practice for occupational safety for oil and gas well drilling and servicing operations. 54. 3rd ed: API recommended practice 54
U1  - Bibliorato 
PY  - 1999///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normas API
KW  - Normalización
ER  -