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HARVARD Citation
Unknown (2018) Introduction to the theory of logic. [Online]. Place of publication not identified : Routledge. Available from: http://access.bl.uk/ark:/81055/vdc_100055729627.0x000001
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Unknown (2018) Introduction to the theory of logic. [Online]. Place of publication not identified : Routledge. Available from: http://access.bl.uk/ark:/81055/vdc_100055729627.0x000001