Two billion cars: driving toward sustainability
References
^ Sperling, Daniel and Deborah Gordon (2012). Two billion cars: driving toward sustainability, [[Oxford University Press]], New York. ISBN 9780195376647 (revised Apr 2012)^ Sperling, Daniel and Deborah Gordon (2012). Two billion cars: driving toward sustainability, [[Oxford University Press]], New York. ISBN 9780195376647 (revised Apr 2012)
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