APA-ийн эшлэл(7 дахь хэвлэлт)

Ludwig, G. H. (2011). Opening space research: Dreams, technology, and scientific discovery. American Geophysical Union.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Ludwig, George H. Opening Space Research: Dreams, Technology, and Scientific Discovery. Washington, DC: American Geophysical Union, 2011.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Ludwig, George H. Opening Space Research: Dreams, Technology, and Scientific Discovery. American Geophysical Union, 2011.