APA

(2020). Digestive Wellness: Strengthen the Immune System and Prevent Disease Through Healthy Digestion. الولايات المتحدة الأمريكية: دار McGraw-Hill ،.

Chicago

2020. Digestive Wellness: Strengthen the Immune System and Prevent Disease Through Healthy Digestion. الولايات المتحدة الأمريكية: دار McGraw-Hill ،.

Harvard

(2020). Digestive Wellness: Strengthen the Immune System and Prevent Disease Through Healthy Digestion. الولايات المتحدة الأمريكية: دار McGraw-Hill ،.

MLA

Digestive Wellness: Strengthen the Immune System and Prevent Disease Through Healthy Digestion. الولايات المتحدة الأمريكية: دار McGraw-Hill ،. 2020.