Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Public Health Service Publications. Washington: U.S. Department of Health Education and Welfare.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
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