Não informado. (2003). Concrete building and concret products. Cement and Concrete Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Concrete Building and Concret Products. London: Cement and Concrete Association, 2003.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Concrete Building and Concret Products. Cement and Concrete Association, 2003.
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