Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
Chicago-viite (17. p.)Não informado. Public Health Service Publications. Washington: U.S. Department of Health Education and Welfare.
MLA-viite (8. p.)Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.