1. BD:OAS;Carey,1978
2. (1990): Exstrophy of cloaca sequence. In (ed): “Birth Defects Encyclopedia.” Oxford: Blackwell Scientific Publications, pp 648-649.
3. BD:OAS;Optiz,1993
4. (1990): Oculo-auriculo-vertebral anomaly. In (ed): “Birth Defects Encyclopedia.” Oxford: Blackwell Scientific Publications, pp 1272-1274.