Chemical Safety and Hazard Investigation Board. [Valero refinery asphyxiation incident].
Chicago-čujuhus (17. p.)Chemical Safety and Hazard Investigation Board. [Valero Refinery Asphyxiation Incident].
MLA-čujuhus (9. p.)Chemical Safety and Hazard Investigation Board. [Valero Refinery Asphyxiation Incident].
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.