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Maccollum, D., V. (2007). Construction safety engineering principles: designing and managing safer job sites (-). new york: Akademi Komunitas Perkebunan Yogyakarta.

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Maccollum, D., V.. Construction safety engineering principles: designing and managing safer job sites. - new york: Akademi Komunitas Perkebunan Yogyakarta, 2007. Text.