Johnson-Freese, J. (2009). Heavenly ambitions: America's quest to dominate space. University of Pennsylvania Press.
Chicago-referens (17:e uppl.)Johnson-Freese, Joan. Heavenly Ambitions: America's Quest to Dominate Space. Philadelphia: University of Pennsylvania Press, 2009.
MLA-referens (9:e uppl.)Johnson-Freese, Joan. Heavenly Ambitions: America's Quest to Dominate Space. University of Pennsylvania Press, 2009.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.