Johnsen, K. G. (1979). Apple country interurban: A history of the Yakima Valley Transportation Company and the Yakima interurban trolley lines. Golden West Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnsen, Kenneth G. Apple Country Interurban: A History of the Yakima Valley Transportation Company and the Yakima Interurban Trolley Lines. San Marino, Calif.: Golden West Books, 1979.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnsen, Kenneth G. Apple Country Interurban: A History of the Yakima Valley Transportation Company and the Yakima Interurban Trolley Lines. Golden West Books, 1979.
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