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APA Citation
Ullman, J. D., & Widom, J. (2014). A first course in database systems. Harlow, Essex : Pearson. http://access.bl.uk/ark:/81055/vdc_100164829354.0x000001
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Ullman, J. D., & Widom, J. (2014). A first course in database systems. Harlow, Essex : Pearson. http://access.bl.uk/ark:/81055/vdc_100164829354.0x000001