CLARK, G. (1965). Prehistoric Societies. Alfred A. Knopf.
Lua i Stíl Chicago (17ú heag.)CLARK, Grahame. Prehistoric Societies. Alfred A. Knopf, 1965.
Lua MLA (8ú heag.)CLARK, Grahame. Prehistoric Societies. Alfred A. Knopf, 1965.
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