اكتشف مناهل المعرفة!

توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Center for Disease Control & Centers for Disease Control (U.S.). (1981). Foodborne disease surveillance, annual summary. Dept. of Health and Human Services, Public Health Service.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Center for Disease Control و Centers for Disease Control (U.S.). Foodborne Disease Surveillance, Annual Summary. Atlanta, Ga.: Dept. of Health and Human Services, Public Health Service, 1981.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Center for Disease Control و Centers for Disease Control (U.S.). Foodborne Disease Surveillance, Annual Summary. Dept. of Health and Human Services, Public Health Service, 1981.