National Research Council (U.S.). Space Studies Board & ebrary, Inc. (2008). Opening new frontiers in space: Choices for the next new frontiers : announcement of opportunity. National Academies Press.
Chicago-čujuhus (17. p.)National Research Council (U.S.). Space Studies Board juo Inc ebrary. Opening New Frontiers in Space: Choices for the Next New Frontiers : Announcement of Opportunity. Washington: National Academies Press, 2008.
MLA-čujuhus (9. p.)National Research Council (U.S.). Space Studies Board juo Inc ebrary. Opening New Frontiers in Space: Choices for the Next New Frontiers : Announcement of Opportunity. National Academies Press, 2008.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.