Cook, E. F. (1966). Tufflavas and ignimbrites: A survey of Soviet studies. American Elsevier Pub. Co.
Chicago-viite (17. p.)Cook, Earl Ferguson. Tufflavas and Ignimbrites: A Survey of Soviet Studies. New York: American Elsevier Pub. Co, 1966.
MLA-viite (9. p.)Cook, Earl Ferguson. Tufflavas and Ignimbrites: A Survey of Soviet Studies. American Elsevier Pub. Co, 1966.
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