BOYD ROBERT & SILK B. JOAN. HOW HUMANS EVOLVED (1ST ED.).
Chicago-čujuhus (17. p.)BOYD ROBERT juo SILK B. JOAN. HOW HUMANS EVOLVED. 1ST ED. NEW YORK,LONDON.
MLA-čujuhus (9. p.)BOYD ROBERT juo SILK B. JOAN. HOW HUMANS EVOLVED. 1ST ED.
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