World health Organization. (2001). Health research methodology: A guide for training in research methodology (2nd- ed.). World Health organization.
Citación estilo ChicagoWorld health Organization. Health Research Methodology: A Guide for Training in Research Methodology. 2nd- ed. Manila: World Health organization, 2001.
Cita MLAWorld health Organization. Health Research Methodology: A Guide for Training in Research Methodology. 2nd- ed. World Health organization, 2001.
Warning: These citations may not always be 100% accurate.