United Nations Centre for Regional Development (2011) Formulation of a National Environmentally Sustainable Transport Strategy for the Philippines – Final Report, May 2011, copyright 2010 by the UNCRD, U.P. National Center for Transportation Studies.
U.P. National Center for Transportation Studies (2009) EST Casebook: Leading Practices of Philippine Cities on Environmentally Sustainable Transport (EST), November 2009, supported by DENR-UNDP Environment and Natural Resources Capacity and Operations Enhancement (ENR-CORE).