Keith, T. B., & Pole, G. A. (1976). The horse interlude: A pictorial history of horse and man in the inland Northwest. University Press of Idaho.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeith, Thomas B., और Gregory A. Pole. The Horse Interlude: A Pictorial History of Horse and Man in the Inland Northwest. Moscow: University Press of Idaho, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKeith, Thomas B., और Gregory A. Pole. The Horse Interlude: A Pictorial History of Horse and Man in the Inland Northwest. University Press of Idaho, 1976.
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