APA (7 वां संस्करण) प्रशस्ति पत्र
Gray,W.S. Concrete water towers, bunkers, silos and other elevated structures. Concrete Pub. Ltd. 4th ed.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Gray,W.S. Concrete Water Towers, Bunkers, Silos and Other Elevated Structures. London: Concrete Pub. Ltd. 4th ed.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Gray,W.S. Concrete Water Towers, Bunkers, Silos and Other Elevated Structures. Concrete Pub. Ltd. 4th ed.
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