1. Higgins, M. W.: The geology of Newberry Caldera, Central Oregon. Ph. D. dissert., University of California, Santa Barbara, California (1968).
2. ?, Walters, A. C.: Newberry Caldera, Oregon: a preliminary report. Ore Bin 29, 37?60 (1967).
3. Moroney, M. J.: Facts from figures: Baltimore, Maryland: Penguin Books 1951.
4. Peterson, N. V., Groh, E. A. (editors): State of Oregon lunar geologic field conference guidebook: State of Oregon Department of Geology and Mineral Industries, Bull. 57, 11?18 (1965).
5. Williams, H.: Newberry volcano of Central Oregon. Bull. Geol. Soc. Am. 46, 253?304 (1935).