APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, & Okpara, J. O. (2008). Globalization of business: Theories and strategies for tomorrow's managers. Adonis & Abbey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और John O. Okpara. Globalization of Business: Theories and Strategies for Tomorrow's Managers. London: Adonis & Abbey, 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और John O. Okpara. Globalization of Business: Theories and Strategies for Tomorrow's Managers. Adonis & Abbey, 2008.
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