Corder, S. (1971). An intermediate english practice book: Key to the exercises. Longman.
Citazione stile Chigago Style (17a edizione)Corder, S.Pit. An Intermediate English Practice Book: Key to the Exercises. London: Longman, 1971.
Citatione MLA (9a ed.)Corder, S.Pit. An Intermediate English Practice Book: Key to the Exercises. Longman, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.