McCartney, Allen P.; Douglas W. Veltre (1999). Aleutian Island Prehistory: Living in Insular Extremes (abstract). Taylor & Francis. JSTOR1550607.
Black, Robert F. (1976). Geology of Umnak Island, Eastern Aleutian Islands as Related to the Aleuts (abstract). 8. University of Colorado: 7—35. JSTOR1550607.