Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Public Health Service Publications. Washington: U.S. Department of Health Education and Welfare.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.