Ng, H. L. C. (2012). Association between dietary pattern and β-carotene intake with oral cancer risk / Helen Ng Lee Ching.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ng, Helen Lee Ching. Association Between Dietary Pattern and β-carotene Intake with Oral Cancer Risk / Helen Ng Lee Ching. 2012.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ng, Helen Lee Ching. Association Between Dietary Pattern and β-carotene Intake with Oral Cancer Risk / Helen Ng Lee Ching. 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.