Gray, W. S. (1953). Reinforced concrete water towers, bunkers, silos, and gantries (3d ed.). London: Concrete Publications.
Παραπομπή Chicago StyleGray, William Samuel. Reinforced Concrete Water Towers, Bunkers, Silos, and Gantries. 3d ed. London: Concrete Publications, 1953.
Παραπομπή MLAGray, William Samuel. Reinforced Concrete Water Towers, Bunkers, Silos, and Gantries. 3d ed. London: Concrete Publications, 1953.
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