World health Organization. (2001). Health research methodology: A guide for training in research methodology (2nd- ed.). World Health organization.
Цитирование в стиле Чикаго (17-е изд.)World health Organization. Health Research Methodology: A Guide for Training in Research Methodology. 2nd- ed. Manila: World Health organization, 2001.
Цитирование MLA (8-е изд.)World health Organization. Health Research Methodology: A Guide for Training in Research Methodology. 2nd- ed. World Health organization, 2001.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.