Ball, Jeffrey (21 மார்ச் 2017). "The New Solar System – Executive Summary"(PDF). Stanford University Law School, Steyer-Taylor Center for Energy Policy and Finance. Archived(PDF) from the original on 20 ஏப்ரல் 2017. Retrieved 21 சூன் 2017.
Ball, Jeffrey (21 மார்ச் 2017). "The New Solar System – Executive Summary"(PDF). Stanford University Law School, Steyer-Taylor Center for Energy Policy and Finance. Archived(PDF) from the original on 20 ஏப்ரல் 2017. Retrieved 21 சூன் 2017.