1. 1. Huchzermeyer FW. Ostrich Diseases. Agricultural Research Council, Onderstepoort, Republic of South Africa, 1994.
2. 2. The Merck Veterinary Manual, Fourth Addition
3. 3. Fossum TW. Small Animal Surgery, 2nd Edition, Mosby Publication Missouri. 2002; 372-425.
4. Ostrich (Struthio camelus) gastric diseases in Minas Gerais, Brazil, from 1997 to 2009;Mendonça;Arquivo Brasileiro de Medicina Veterinária e Zootecnia,2010
5. 5. Speer BL. Developmental problems in young ratites. In: Tully, T. N., S. M. SHANE (eds.) Ratite management, medicine, and Surgery. Malabar Florida: Krieger Publishing. 1996; 147-154.