1. Incidence of testicular;0, Baumrucker. G.;Army med. Dep,1946
2. Ober Ektopia Testis. Kide Quoted by;Hempel, 0. K;Laacet; Pathology and treatment of the retained testis in childhood,1911
3. Ueber Kryptorchismus und Anomalien des Descensus Testiculi;Hofstatter, R.;Klin. Jb,1912
4. Johnson, W. W. (1939). Cryptorchidism. J. Amer. med. Ass., 113, 25.
5. Lancet (1957). EditoriaL 2.