Ball, A. (1994). Multi-city study on drug injecting and risk of HIV infection: A report prepared on behalf of the WHO International Collaborative Group. Programme on Substance Abuse, World Health Organization.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ball, Andrew. Multi-city Study on Drug Injecting and Risk of HIV Infection: A Report Prepared on Behalf of the WHO International Collaborative Group. Geneva: Programme on Substance Abuse, World Health Organization, 1994.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ball, Andrew. Multi-city Study on Drug Injecting and Risk of HIV Infection: A Report Prepared on Behalf of the WHO International Collaborative Group. Programme on Substance Abuse, World Health Organization, 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.