1.http://www.akc.org/expert-advice/nutrition/natural-foods/can-dogs-eat-mango/ 2.https://www.acvs.org/small-animal/gastrointestinal-foreign-bodies
3.https://ndb.nal.usda.gov/ndb/foods/show/2271
4.http://www.akc.org/expert-advice/nutrition/general-nutrition/benefits-high-fiber-dog-foods
5.https://www.vetinfo.com/benefits-of-calcium-dogs.html
6.https://www.vetinfo.com/vitamin-a-for-dogs.html
7.https://vcahospitals.com/know-your-pet/vitamin-a-toxicosis-in-dogs
8.https://www.vetinfo.com/vitamin-b-complex-for-dogs.html 9.https://www.dsm.com/markets/anh/en_US/Compendium/companion_animals/vitamin_B6.html
10.http://www.petwave.com/Dogs/Basics/Vitamin-C.aspx
11.https://www.petmd.com/dog/nutrition/vitamin-e-good-dogs