XANTHAKOS, P. P. (1994). Ground Control And Improvesment Petros P Xanthakos , Lee W. Abramson, Donald A. Bruce. John Willey & Sons Inc.
Lua i Stíl Chicago (17ú heag.)XANTHAKOS, Petros P. Ground Control And Improvesment Petros P Xanthakos , Lee W. Abramson, Donald A. Bruce. John Willey & Sons Inc, 1994.
Lua MLA (8ú heag.)XANTHAKOS, Petros P. Ground Control And Improvesment Petros P Xanthakos , Lee W. Abramson, Donald A. Bruce. John Willey & Sons Inc, 1994.
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