Gabler, R. E. Blue skies: College edition. Victoria, Australia: Brooks/Cole.
Chicago Style aipamenaGabler, Robert E. Blue Skies: College Edition. Victoria, Australia: Brooks/Cole.
MLA aipamenaGabler, Robert E. Blue Skies: College Edition. Victoria, Australia: Brooks/Cole.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.