Twort, A. C. (2004). Civil engineering project management Alan C. Twort, J. Gordon Rees. Elsevier.
Lua i Stíl Chicago (17ú heag.)Twort, Alan C. Civil Engineering Project Management Alan C. Twort, J. Gordon Rees. Elsevier, 2004.
Lua MLA (8ú heag.)Twort, Alan C. Civil Engineering Project Management Alan C. Twort, J. Gordon Rees. Elsevier, 2004.
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