APA (7th ed.) Zitazioa
ebrary, Inc, Buckley, R., & Font, X. (2001). Tourism ecolabelling: Certification and promotion of sustainable management. CABI Pub..
Chicago Style (17th ed.) Zitazioa
ebrary, Inc, Ralf Buckley, eta Xavier Font. Tourism Ecolabelling: Certification and Promotion of Sustainable Management. Wallingford, Oxon ; New York: CABI Pub., 2001.
MLA (9th ed.) Zitazioa
ebrary, Inc, et al. Tourism Ecolabelling: Certification and Promotion of Sustainable Management. CABI Pub., 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.