APA (7th ed.) Zitazioa
Teachers Insurance & Annuity Association of America (TIAA) MarketLine Company Profile. Marketline.
Chicago Style (17th ed.) Zitazioa
Teachers Insurance & Annuity Association of America (TIAA) MarketLine Company Profile. Marketline.
MLA (9th ed.) Zitazioa
Teachers Insurance & Annuity Association of America (TIAA) MarketLine Company Profile. Marketline.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.