NAWCC Chapter 50, NAWCC Chapter 53, NAWCC Chapter 135, & Waddell, D. A. (1989). Street and tower clocks of the State of Washington. D.A. Waddell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNAWCC Chapter 50, NAWCC Chapter 53, NAWCC Chapter 135, और D. A. Waddell. Street and Tower Clocks of the State of Washington. Tacoma, WA (521 No. Cushman, Tacoma 98403): D.A. Waddell, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNAWCC Chapter 50, et al. Street and Tower Clocks of the State of Washington. D.A. Waddell, 1989.
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