International, W. B. C. (1978). Science Year: The world book science annual. U.S.A.
Chicago Edition CitationInternational, World Book Childcraft. Science Year: The World Book Science Annual. Chicago: U.S.A, 1978.
MLA citiranjeInternational, World Book Childcraft. Science Year: The World Book Science Annual. U.S.A, 1978.
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