Johnson, R. L., & Foreyt, B. (1983). Mountain goats and mountain sheep of Washington. Washington Dept. of Game.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Rolf L., और Bill Foreyt. Mountain Goats and Mountain Sheep of Washington. Washington Dept. of Game, 1983.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnson, Rolf L., और Bill Foreyt. Mountain Goats and Mountain Sheep of Washington. Washington Dept. of Game, 1983.
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