World Health Organization. (2001). Sexually transmitted infections: Briefing kit for teachers. World Health Organization.
Citace podle Chicago (17th ed.)World Health Organization. Sexually Transmitted Infections: Briefing Kit for Teachers. Manila, Philippines: World Health Organization, 2001.
Citace podle MLA (8th ed.)World Health Organization. Sexually Transmitted Infections: Briefing Kit for Teachers. World Health Organization, 2001.
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