Parker, S. P., & Pasachoff, J. M. (1993). McGraw-Hill encyclopedia of astronomy. McGraw-Hill.
Chicago Style aipamenaParker, Sybil P., and Jay M. Pasachoff. McGraw-Hill Encyclopedia of Astronomy. New York: McGraw-Hill, 1993.
MLA aipamenaParker, Sybil P., and Jay M. Pasachoff. McGraw-Hill Encyclopedia of Astronomy. McGraw-Hill, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.