391705 Langan, J. (1985). English skills. New York : McGraw-Hill.
Chicago-čujuhus (17. p.)391705 Langan, John. English Skills. New York : McGraw-Hill, 1985.
MLA-čujuhus (9. p.)391705 Langan, John. English Skills. New York : McGraw-Hill, 1985.
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