Marcott et al. 2009, p. 183. Marcott, S. A.; Fountain, A. G.; O'Connor, J. E.; Sniffen, P. J.; Dethierd, D. P. (2009). "A latest Pleistocene and Holocene glacial history and paleoclimate reconstruction at Three Sisters and Broken Top Volcanoes, Oregon, U.S.A.". Quaternary Research. 71 (2): 181–189. Bibcode:2009QuRes..71..181M. doi:10.1016/j.yqres.2008.09.002. S2CID129150777.
Marcott et al. 2009, p. 183. Marcott, S. A.; Fountain, A. G.; O'Connor, J. E.; Sniffen, P. J.; Dethierd, D. P. (2009). "A latest Pleistocene and Holocene glacial history and paleoclimate reconstruction at Three Sisters and Broken Top Volcanoes, Oregon, U.S.A.". Quaternary Research. 71 (2): 181–189. Bibcode:2009QuRes..71..181M. doi:10.1016/j.yqres.2008.09.002. S2CID129150777.
Williams 1944, p. 45. Williams, H. (1944). Louderback, G. D.; Anderson, C. A.; Camp, C. L.; Chaney, R. W. (eds.). "Volcanoes of the Three Sisters Region, Oregon Cascades"(PDF). Bulletin of the Department of Geological Sciences. 27 (3). University of California Press: 37–84. Retrieved November 26, 2017.
Williams 1944, p. 52. Williams, H. (1944). Louderback, G. D.; Anderson, C. A.; Camp, C. L.; Chaney, R. W. (eds.). "Volcanoes of the Three Sisters Region, Oregon Cascades"(PDF). Bulletin of the Department of Geological Sciences. 27 (3). University of California Press: 37–84. Retrieved November 26, 2017.
Williams 1944, p. 54. Williams, H. (1944). Louderback, G. D.; Anderson, C. A.; Camp, C. L.; Chaney, R. W. (eds.). "Volcanoes of the Three Sisters Region, Oregon Cascades"(PDF). Bulletin of the Department of Geological Sciences. 27 (3). University of California Press: 37–84. Retrieved November 26, 2017.
Williams 1944, p. 37. Williams, H. (1944). Louderback, G. D.; Anderson, C. A.; Camp, C. L.; Chaney, R. W. (eds.). "Volcanoes of the Three Sisters Region, Oregon Cascades"(PDF). Bulletin of the Department of Geological Sciences. 27 (3). University of California Press: 37–84. Retrieved November 26, 2017.
Marcott et al. 2009, p. 183. Marcott, S. A.; Fountain, A. G.; O'Connor, J. E.; Sniffen, P. J.; Dethierd, D. P. (2009). "A latest Pleistocene and Holocene glacial history and paleoclimate reconstruction at Three Sisters and Broken Top Volcanoes, Oregon, U.S.A.". Quaternary Research. 71 (2): 181–189. Bibcode:2009QuRes..71..181M. doi:10.1016/j.yqres.2008.09.002. S2CID129150777.