Freeman, R. E. a. (2015). Bridging the Value Gap. Harpercollins.
Lua i Stíl Chicago (17ú heag.)Freeman, R. Edward; auster. Bridging the Value Gap. Noida: Harpercollins, 2015.
Lua MLA (9ú heag.)Freeman, R. Edward; auster. Bridging the Value Gap. Harpercollins, 2015.
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