LeapFrog Productions, inc, & United States. Bureau of Land Management. (2001). The vanishing shrub-steppe. Bureau of Land Management.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLeapFrog Productions, inc, और United States. Bureau of Land Management. The Vanishing Shrub-steppe. Wenatchee, WA: Bureau of Land Management, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLeapFrog Productions, inc, और United States. Bureau of Land Management. The Vanishing Shrub-steppe. Bureau of Land Management, 2001.
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