Feinberg, L., & Feinberg, L. (1959). Unified exercises: An English grammar and workbook. Oxford University Press.
Chicago Style (17. basım) AtıfFeinberg, Leonard, ve Lilian Feinberg. Unified Exercises: An English Grammar and Workbook. New York: Oxford University Press, 1959.
MLA (9th ed.) AtıfFeinberg, Leonard, ve Lilian Feinberg. Unified Exercises: An English Grammar and Workbook. Oxford University Press, 1959.
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