Steels, M. H. (1999). Effective training for civil engineers. Thomas Telford.
Lua i Stíl Chicago (17ú heag.)Steels, Macdonald H. Effective Training for Civil Engineers. Thomas Telford, 1999.
Lua MLA (8ú heag.)Steels, Macdonald H. Effective Training for Civil Engineers. Thomas Telford, 1999.
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