Cita APA (7a ed.)

Eastwood, J., & Mackin, R. (1990). A basic english grammar with exercises: Without key edition ([1st ed., 4th imp.].). Oxford University Press.

Cita Chicago Style (17a ed.)

Eastwood, John, y Ronald Mackin. A Basic English Grammar with Exercises: Without Key Edition. [1st ed., 4th imp.]. Oxford: Oxford University Press, 1990.

Cita MLA (9a ed.)

Eastwood, John, y Ronald Mackin. A Basic English Grammar with Exercises: Without Key Edition. [1st ed., 4th imp.]. Oxford University Press, 1990.