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APA Citation
Unknown (2000). Intrinsic and extrinsic motivation : the search for optimal motivation and performance. Place of publication not identified : Academic Press. http://access.bl.uk/ark:/81055/vdc_100026151810.0x000001
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Unknown (2000). Intrinsic and extrinsic motivation : the search for optimal motivation and performance. Place of publication not identified : Academic Press. http://access.bl.uk/ark:/81055/vdc_100026151810.0x000001