STEINHOFF, D. The World of Businnes, Volume 2. Grolier Incoporated.
Lua i Stíl Chicago (17ú heag.)STEINHOFF, Dan. The World of Businnes, Volume 2. Grolier Incoporated.
Lua MLA (8ú heag.)STEINHOFF, Dan. The World of Businnes, Volume 2. Grolier Incoporated.
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