[367-373] RECORD OF UNMANNED LUNAR PROBES, 1958-1968: Soviet Union. DESTINATIONMOON: A History of the Lunar Orbiter Program. National Aeronautics and Space
Abstract #1815 (2000) DESTINATIONMOON: A history of the Lunar Orbiter Program (PDF) 1976, NASA TM X-3487 (页面存档备份,存于互联网档案馆) DESTINATIONMOON: A history of the