Cita APA (7a ed.)
Allen, W. S. (1973). Leving English structure: Key to the exercises. Longman.
Cita Chicago Style (17a ed.)
Allen, W. Stannard. Leving English Structure: Key to the Exercises. London: Longman, 1973.
Cita MLA (9a ed.)
Allen, W. Stannard. Leving English Structure: Key to the Exercises. Longman, 1973.
Precaución: Estas citas no son 100% exactas.