Ek, J. A. v., & Robat, N. J. (1984). The student's grammar of English. Blackwell.
Lua i Stíl Chicago (17ú heag.)Ek, J. A. van, agus Nico J. Robat. The Student's Grammar of English. Oxford: Blackwell, 1984.
Lua MLA (9ú heag.)Ek, J. A. van, agus Nico J. Robat. The Student's Grammar of English. Blackwell, 1984.
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