Westgate, John, 1988, Isothermal plateau fission-track age of the late Pleistocene Old Crow Tephra, Alaska: Geophysical Research Letters, v. 15, n. 4, p. 376-379.
McDowell, P.F., Edwards, M.E., 2001, Evidence of Quaternary climatic variations in a sequence of loess and related deposits at Birch Creek, Alaska: implications for the Stage 5 climatic chronology: Quaternary Science Reviews v. 20, p. 63-76.
Westgate, J.A., 1989, Isothermal plateau fission-track ages of hydrated glass shards from silicic tephra beds: Earth and Planetary Science Letters, v. 95, n. 3, p. 226-234.