Παραπομπή APA

(1971). Specification for concrete roofing tiles and fittings. London: British Standards Institution.

Παραπομπή Chicago Style

Specification for Concrete Roofing Tiles and Fittings. London: British Standards Institution, 1971.

Παραπομπή MLA

Specification for Concrete Roofing Tiles and Fittings. London: British Standards Institution, 1971.

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