[2008-09-24]. (原始内容存档于2011-05-24). German Astronomical Society (AG) awards RobertWilliams the Karl Schwarzschild Medal. June 28, 2016 [November 20, 2016]. (原始内容存档于2019-08-17)
1088/0004-637x/808/2/139. Williams, Matt. What are Magellanic clouds?. phys.org. November 2016. (原始内容存档于2018-08-21). Smith, Robert T. The Radial Velocity