Lenburg, J. (2007). Viva- Facts On File guide to research. Viva Books Pvt. ltd..
Chicago Style (17. basım) AtıfLenburg, Jeff. Viva- Facts On File Guide to Research. New Delhi: Viva Books Pvt. ltd., 2007.
MLA (8th ed.) AtıfLenburg, Jeff. Viva- Facts On File Guide to Research. Viva Books Pvt. ltd., 2007.
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