World Health Organization. (1999). Sexually transmitted infections prevalence study methodology. World Health Organization.
Цитирование в стиле Чикаго (17-е изд.)World Health Organization. Sexually Transmitted Infections Prevalence Study Methodology. Geneva,Switzerland: World Health Organization, 1999.
Цитирование MLA (8-е изд.)World Health Organization. Sexually Transmitted Infections Prevalence Study Methodology. World Health Organization, 1999.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.