OBRIEN MARK. (1984). MBA ANSWER BOOK: A CARRER GUIDE FOR PERSON WHO MEAN BUSINESS. PRENTICE -HALL INTERNATIONAL, INC.
Lua i Stíl Chicago (17ú heag.)OBRIEN MARK. MBA ANSWER BOOK: A CARRER GUIDE FOR PERSON WHO MEAN BUSINESS. NEW JERSE: PRENTICE -HALL INTERNATIONAL, INC, 1984.
Lua MLA (9ú heag.)OBRIEN MARK. MBA ANSWER BOOK: A CARRER GUIDE FOR PERSON WHO MEAN BUSINESS. PRENTICE -HALL INTERNATIONAL, INC, 1984.
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