Cita APA (7th ed.)

World health Organization. (2001). Health research methodology: A guide for training in research methodology (2nd- ed.). World Health organization.

Cita Chicago (17th ed.)

World health Organization. Health Research Methodology: A Guide for Training in Research Methodology. 2nd- ed. Manila: World Health organization, 2001.

Cita MLA (8th ed.)

World health Organization. Health Research Methodology: A Guide for Training in Research Methodology. 2nd- ed. World Health organization, 2001.