Tham khảo Asturias

    • Bowen-Jones, H. and W.B. Fisher. Spain: An Introductory Geography. New York: Praeger, 1966.
    • Dresner, Denise, ed. Guide to the World. Phoenix: Oryx Press, 1998. S.v. "Asturias"
    • Encyclopedia Americana. Danbury: Grolier, 2002. S.v. "Asturias"
    • Merriam-Webster's Geographical Dictionary. Springfield: Merriam-Webster, 1997. S.v. "Asturias"