Harris, F. (1994). Modern Construction And Ground Engineering Equipment And Methods. Longman Scientific & Technical.
Lua i Stíl Chicago (17ú heag.)Harris, Frank. Modern Construction And Ground Engineering Equipment And Methods. Longman Scientific & Technical, 1994.
Lua MLA (8ú heag.)Harris, Frank. Modern Construction And Ground Engineering Equipment And Methods. Longman Scientific & Technical, 1994.
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