TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Recommended practice for classification of locations for electrical installations at petroleum facilities classified as class I, division 1 and division 2: API Recommended Practice 500
U1  - Caja 14 
PY  - 2012///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normas API
KW  - Normalización
ER  -