Cita APA (7a ed.)

Ek, J. A. v., & Robat, N. J. (1984). The student's grammar of English. Blackwell.

Cita Chicago Style (17a ed.)

Ek, Jan A. van, y Nico J. Robat. The Student's Grammar of English. Oxford: Blackwell, 1984.

Cita MLA (9a ed.)

Ek, Jan A. van, y Nico J. Robat. The Student's Grammar of English. Blackwell, 1984.