def self.source_info
        {
          base_url: 'http://www.cancercommons.org/researchers-clinicians/',
          site_url: 'http://www.cancercommons.org/',
          citation: 'Cancer Commons: Biomedicine in the Internet Age. Shrager J, Tenenbaum JM, and Travers M. Collaborative Computational Technologies for Biomedical Research, (Sean Elkins, Maggie Hupcey, and Antony Williams Eds). Wiley, 2010.',