1. Urachus, its anatomy, histology and development;Begg;J Anat,1930
2. Developmental Anatomy;Arey,1965
3. The Lower Urinary Tract in Childhood: Some Correlated Clinical and Roentgenologic Observations;Kjellberg,1957
4. Radiografic findings in anomalies of the urachus;Ney;J Urol,1968
5. The urachus, its anatomy and associated fasciae;Hammond;Anat Rec,1941