Bergen, J. J., & Bills, G. D. (1983). Spanish and portuguese in social context. Georgetown University Press.
Chicago Style (17. basım) AtıfBergen, John J., ve Garland D. Bills. Spanish and Portuguese in Social Context. Washington, D.C: Georgetown University Press, 1983.
MLA (9th ed.) AtıfBergen, John J., ve Garland D. Bills. Spanish and Portuguese in Social Context. Georgetown University Press, 1983.
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