Cita APA (7th ed.)

World Health Organization. (1971). Oral health surveys: Basic methods. [s.n.

Cita Chicago (17th ed.)

World Health Organization. Oral Health Surveys: Basic Methods. Genava: [s.n, 1971.

Cita MLA (9th ed.)

World Health Organization. Oral Health Surveys: Basic Methods. [s.n, 1971.