Rodrigo, V. (2016). Graded Readers: Validating Reading Levels across Publishers.
Citazione stile Chigago Style (17a edizione)Rodrigo, Victoria. Graded Readers: Validating Reading Levels Across Publishers. 2016.
Citatione MLA (9a ed.)Rodrigo, Victoria. Graded Readers: Validating Reading Levels Across Publishers. 2016.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.