Workflow: Enhanced Data Management, New Cartographic Tools, and More Efficient Information Sharing" (Press-reliz). ESRI. 2008-06-25. 2008-06-30 tarixində...
McGill, Tracy. "3 Reasons Light Rail Is an Efficient Transportation Option for U.S. Cities". MetaEfficient. 1 yanvar 2011. 2013-05-07 tarixində arxivləşdirilib...