KERROD, R. Encyclopedi of science 10: Transportation from the bicycle to spacecraft. Macmillan Publishinng Company.
Chicago-referens (17:e uppl.)KERROD, Robin. Encyclopedi of Science 10: Transportation from the Bicycle to Spacecraft. Macmillan Publishinng Company.
MLA-referens (8:e uppl.)KERROD, Robin. Encyclopedi of Science 10: Transportation from the Bicycle to Spacecraft. Macmillan Publishinng Company.
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