APA (7th ed.) Zitazioa
Tourism Flows in Germany. Euromonitor International Ltd.
Chicago Style (17th ed.) Zitazioa
Tourism Flows in Germany. Euromonitor International Ltd.
MLA (9th ed.) Zitazioa
Tourism Flows in Germany. Euromonitor International Ltd.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.