Michael S. Horn Pryce Davis Aleata K. Hubbard Danielle Keifert Zeina Atrash Leong Izabel C. Olson Learning sustainability: families, learning, and next-generation eco-feedback technology. 161-164 2011 IDC http://doi.acm.org/10.1145/1999030.1999051 conf/acmidc/2011 db/conf/acmidc/idc2011.html#HornDHKLO11