1. Tentative Standard Specifications for Reinforced Concrete Water Pipe-Steel Cylinder Type, Prestressed-7B.2-T-1949 Am. Water Works Assn., New York 1949
2. Marston , Anson The Theory of External Loads on Closed Conduits Bul. 96, Iowa State Coll. Ames, Iowa 1930
3. Prestressed Concrete Pipe … by a New Manufacturing Method;Anon;Eng. News-Rec.,1943
4. Prestressed Reinforced Concrete Pipe;Longley;J.N.E.W.W.A.,1945