Sources

Every source backing a fact on David England's own page, deduplicated — the same source backing several facts appears once.

• http://chi2012.acm.org/ — http://chi2012.acm.org/
• http://chi2012.acm.org/ — http://chi2012.acm.org/
• http://chi2013.acm.org/ — http://chi2013.acm.org/
• http://chi2013.acm.org/ — http://chi2013.acm.org/
• http://chi2014.acm.org/ — http://chi2014.acm.org/
• http://chi2014.acm.org/ — http://chi2014.acm.org/