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APA Citation
Sie, R. L., Ullmann, T. D., Rajagopal, K., Cela, K., Bitter-Rijpkema, M., & Sloep, P. B. (2012). social network analysis for technology-enhanced learning: review and future directions. International journal of technology enhanced learning, 4, 172–190. http://access.bl.uk/ark:/81055/vdc_100074185206.0x000009