APA (7th ed.) Zitazioa
Olsen, S. (1944). Danish Charophyta: Chorolog., ecolog., and biolog. investigations. Munksgaard.
Chicago Style (17th ed.) Zitazioa
Olsen, Sigurd. Danish Charophyta: Chorolog., Ecolog., and Biolog. Investigations. København: Munksgaard, 1944.
MLA (9th ed.) Zitazioa
Olsen, Sigurd. Danish Charophyta: Chorolog., Ecolog., and Biolog. Investigations. Munksgaard, 1944.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.