(原始内容存档于2015-05-01). Fichter, Lynn S. Cross Section K, The Late Paleozoic Alleghanian Orogeny. The Geological Evolution of Virginia and the Mid-Atlantic Region
between the Template:Wmata and Template:Wmata stations, including the junction with the future Yellow Line, was built at the same time as the other Metro
of Essential Concepts and Processes from around the World. White River Junction, Vermont: Chelsea Green Publishing. 2012 [2022-01-14]. ISBN 978-1-60358-364-0