McFarland Keith R. (2008). The Breakthrough Company. Crown Publishers Group,Randam House Inc.
Lua i Stíl Chicago (17ú heag.)McFarland Keith R. The Breakthrough Company. USA: Crown Publishers Group,Randam House Inc, 2008.
Lua MLA (9ú heag.)McFarland Keith R. The Breakthrough Company. Crown Publishers Group,Randam House Inc, 2008.
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