Dellar, H., & Walkley, A. (2007). Course book Innovations: A course in natural english. Thomson.
Citazione stile Chigago Style (17a edizione)Dellar, Hugh, e Andrew Walkley. Course Book Innovations: A Course in Natural English. United Kingdom: Thomson, 2007.
Citatione MLA (9a ed.)Dellar, Hugh, e Andrew Walkley. Course Book Innovations: A Course in Natural English. Thomson, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.