page=20190101. pluto.jhuapl.edu. [2019-01-01]. (原始内容存档于2019-10-21). A Survey of Mission Opportunities to Trans-Neptunian Objects. ResearchGate. [2019-09-23]
estimated loss: D'Alessandro (2024) Heaven'sGate Canadian and U.S. gross and production budget: Heaven'sGate (1980). Box Office Mojo. [2016-01-20]. (原始内容存档于2019-08-16)