Lankford, A. (2010). Ranger confidential: Living, working, and dying in the national parks.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLankford, Andrea. Ranger Confidential: Living, Working, and Dying in the National Parks. 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLankford, Andrea. Ranger Confidential: Living, Working, and Dying in the National Parks. 2010.
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