KERROD, R. Encyclopedi of science: Tools and tomorrow. Volume XII. Macmillan Publishing Company.
Chicago-viite (17. p.)KERROD, Robin. Encyclopedi of Science: Tools and Tomorrow. Volume XII. Macmillan Publishing Company.
MLA-viite (8. p.)KERROD, Robin. Encyclopedi of Science: Tools and Tomorrow. Volume XII. Macmillan Publishing Company.
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