Laverty, C. e. a. (1971). The unity of english. Five basic focal points. Harper and Row.
Chicago-viite (17. p.)Laverty, Carroll et al. The Unity of English. Five Basic Focal Points. New York, Estados Unidos: Harper and Row, 1971.
MLA-viite (9. p.)Laverty, Carroll et al. The Unity of English. Five Basic Focal Points. Harper and Row, 1971.
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