1. ICVGAN. International Committee on Veterinary Gross Anatomical Nomenclature, Nomina Anatomica Veterinaria. 6th ed. Hannover (Germany), Ghent (Belgium), Columbia (MO, USA), Rio de Janeiro (Brazil); 2017.
2. Veterinary Anatomy of Domestic Mammals: Textbook and Colour Atlas;HE König,2009
3. Clinical management and surgical repair of atresia coli in calves: 66 cases (1977–1988);DF Smith;J Am Vet Med Assoc,1991