Pardo, A. N. (2009). ELT Materials: The Key to Fostering Effective Teaching and Learning Settings. Universidad Nacional de Colombia.
Citazione stile Chigago Style (17a edizione)Pardo, Astrid Núñez. ELT Materials: The Key to Fostering Effective Teaching and Learning Settings. Universidad Nacional de Colombia, 2009.
Citatione MLA (9a ed.)Pardo, Astrid Núñez. ELT Materials: The Key to Fostering Effective Teaching and Learning Settings. Universidad Nacional de Colombia, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.