Lua APA (7ú heag.)
Gray,W.S. Concrete water towers, bunkers, silos and other elevated structures. Concrete Pub. Ltd. 4th ed.
Lua i Stíl Chicago (17ú heag.)
Gray,W.S. Concrete Water Towers, Bunkers, Silos and Other Elevated Structures. London: Concrete Pub. Ltd. 4th ed.
Lua MLA (9ú heag.)
Gray,W.S. Concrete Water Towers, Bunkers, Silos and Other Elevated Structures. Concrete Pub. Ltd. 4th ed.
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