Yan, X. (2021). Evaluation of safety and health improvement in population by the implementation strategy of China government during COVID-19 pandemic.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Yan, Xiangyu. Evaluation of Safety and Health Improvement in Population by the Implementation Strategy of China Government During COVID-19 Pandemic. 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Yan, Xiangyu. Evaluation of Safety and Health Improvement in Population by the Implementation Strategy of China Government During COVID-19 Pandemic. 2021.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.