APA (7th ed.) Zitazioa
Worldwide Sporting & Athletic Goods Manufacturing Industry Report. C. Barnes & Co.
Chicago Style (17th ed.) Zitazioa
Worldwide Sporting & Athletic Goods Manufacturing Industry Report. C. Barnes & Co.
MLA (9th ed.) Zitazioa
Worldwide Sporting & Athletic Goods Manufacturing Industry Report. C. Barnes & Co.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.