ACEEE, May 2014, by Kate Farley and Susan Mazur-Stommen.
http://www.aceee.org/files/pdf/white-paper/saving-energy-with-neighborly-behavior.pdf

A White Paper from the American Council for an Energy-Efficient Economy. "Tenant engagement programs encourage the people who live in a multifamily property to change their behavior in order to achieve a goal. These programs are an attractive option for owners or managers who want to improve energy efficiency. In this report, we assess the key features of existing programs, make recommendations for improvements that housing providers and advocates can use immediately, and outline a wish list for the future."