Walter, U. (2020). Astronautics. 3rd ed. Springer International Publishing.
Chicago Style aipamenaWalter, Ulrich. Astronautics. 3rd Ed. Springer International Publishing, 2020.
MLA aipamenaWalter, Ulrich. Astronautics. 3rd Ed. Springer International Publishing, 2020.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.