منبع: https://www.wegreened.com/blog/niw/success-stories-a-successful-tale-of-an-operations-research-specialist-w،-secured-niw-approval-in-just-5-days-after-pursuing-a-ph-d-in-industrial-engineering/
دستهها
منبع: https://www.wegreened.com/blog/niw/success-stories-a-successful-tale-of-an-operations-research-specialist-w،-secured-niw-approval-in-just-5-days-after-pursuing-a-ph-d-in-industrial-engineering/