Steinhoff, D. (1979). The world of business. Grolier.
Lua i Stíl Chicago (17ú heag.)Steinhoff, Dan. The World of Business. [Danbury, Conn.]: Grolier, 1979.
Lua MLA (9ú heag.)Steinhoff, Dan. The World of Business. Grolier, 1979.
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