Παραπομπή σε μορφή APA (7η εκδ.)

Ludwig, G. H. (2011). Opening space research: Dreams, technology, and scientific discovery. American Geophysical Union. https://doi.org/10.1029/062SP

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ludwig, George H. Opening Space Research: Dreams, Technology, and Scientific Discovery. Washington, DC: American Geophysical Union, 2011. https://doi.org/10.1029/062SP.

Παραπομπή σε μορφή MLA (8th εκδ.)

Ludwig, George H. Opening Space Research: Dreams, Technology, and Scientific Discovery. American Geophysical Union, 2011. https://doi.org/10.1029/062SP.