Bortz, F. (2005). Beyond jupiter: The story of planetary astronomer heidi hammel (First edition.). Joseph Henry Press.
Lua i Stíl Chicago (17ú heag.)Bortz, Fred. Beyond Jupiter: The Story of Planetary Astronomer Heidi Hammel. First edition. Washington, D. C.: Joseph Henry Press, 2005.
Lua MLA (9ú heag.)Bortz, Fred. Beyond Jupiter: The Story of Planetary Astronomer Heidi Hammel. First edition. Joseph Henry Press, 2005.
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