Shaw, K. (1990). Collins Cobuild English grammar exercises. Collins; The University Of Birmingham.
Cita Chicago Style (17a ed.)Shaw, Katy. Collins Cobuild English Grammar Exercises. London: Collins; The University Of Birmingham, 1990.
Cita MLA (9a ed.)Shaw, Katy. Collins Cobuild English Grammar Exercises. Collins; The University Of Birmingham, 1990.
Precaución: Estas citas no son 100% exactas.