Health Research Methodology: A guide for training in Research Methods (2nd ed.). WHO.
Citazione stile Chigago Style (17a edizione)Health Research Methodology: A Guide for Training in Research Methods. 2nd ed. Manila: WHO.
Citatione MLA (8a ed.)Health Research Methodology: A Guide for Training in Research Methods. 2nd ed. WHO.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.