Schneider, S. E. (2007). Pathways to astronomy. Boston: McGraw Hill.
Chicago Style aipamenaSchneider, Stephen E. Pathways to Astronomy. Boston: McGraw Hill, 2007.
MLA aipamenaSchneider, Stephen E. Pathways to Astronomy. Boston: McGraw Hill, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.