Grinnell, G. B., & Reiger, J. F. (1972). The passing of the Great West: Selected papers of George Bird Grinnell. Winchester Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGrinnell, George Bird, और John F. Reiger. The Passing of the Great West: Selected Papers of George Bird Grinnell. [New York]: Winchester Press, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGrinnell, George Bird, और John F. Reiger. The Passing of the Great West: Selected Papers of George Bird Grinnell. Winchester Press, 1972.
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