Não informado. (1953). Occupational health bulletin. Department of National Health and Welfare, Industrial Health Division.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Occupational Health Bulletin. Ottawa: Department of National Health and Welfare, Industrial Health Division, 1953.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Occupational Health Bulletin. Department of National Health and Welfare, Industrial Health Division, 1953.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.