Untrauer, R. E. (1970). Design requirements for cast iron soil pipe. Engineering Research Institute, Iowa State University.
Čikaški stil citiranja (17. izdanje)Untrauer, Raymond Ernest. Design Requirements for Cast Iron Soil Pipe. Ames, Iowa: Engineering Research Institute, Iowa State University, 1970.
MLA način citiranja (8. izdanje)Untrauer, Raymond Ernest. Design Requirements for Cast Iron Soil Pipe. Engineering Research Institute, Iowa State University, 1970.
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