Cita APA (7a ed.)
Case, D. English Puzzles 2: Teacher's Resource Book. Heinemann.
Cita estilo Chicago (17a ed.)
Case, Doug. English Puzzles 2: Teacher's Resource Book. Oxford, Inglaterra: Heinemann.
Cita MLA (9a ed.)
Case, Doug. English Puzzles 2: Teacher's Resource Book. Heinemann.
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