February 7, 2009. "Form 10-K". Lenovo Group Limited, UnitedStatesSecuritiesandExchangeCommission. 2008-03-31. मूल से 15 नवंबर 2011 को पुरालेखित. अभिगमन
Systems, Inc. 2017 Annual Report Form (10-K)". EDGAR. UnitedStatesSecuritiesandExchangeCommission. February 27, 2017. मूल से 27 फ़रवरी 2017 को पुरालेखित
"Annual report" (PDF). UnitedStatesSecuritiesandExchangeCommission. "Carrefour Brazil completes the acquisition of Grupo BIG and strengthens its governance"