APA (7th ed.) Zitazioa
Call Centers Industry Profile: Czech Republic. Marketline.
Chicago Style (17th ed.) Zitazioa
Call Centers Industry Profile: Czech Republic. Marketline.
MLA (9th ed.) Zitazioa
Call Centers Industry Profile: Czech Republic. Marketline.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.