Ruetten K. Mary. Developing writing skills. Learners Pub.
Citazione stile Chigago Style (17a edizione)Ruetten K. Mary. Developing Writing Skills. Learners Pub.
Citatione MLA (9a ed.)Ruetten K. Mary. Developing Writing Skills. Learners Pub.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.