Cite
MLA Citation
Unknown. Knocking on heaven's door : how physics and scientific thinking illuminate the universe and the modern world. New York : Ecco, 2011. http://access.bl.uk/ark:/81055/vdc_100049980380.0x000001
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Unknown. Knocking on heaven's door : how physics and scientific thinking illuminate the universe and the modern world. New York : Ecco, 2011. http://access.bl.uk/ark:/81055/vdc_100049980380.0x000001