Não informado. (1987). Safety and health at work. International Occupational Safety and Health Information Centre.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Safety and Health at Work. Geneva, Suíça: International Occupational Safety and Health Information Centre, 1987.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Safety and Health at Work. International Occupational Safety and Health Information Centre, 1987.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.