Khan, I. (1985). Suitability of teaching Eng. thro` coresspondence. Ashish.
Citazione stile Chigago Style (17a edizione)Khan, Inayat. Suitability of Teaching Eng. Thro` Coresspondence. New Delhi: Ashish, 1985.
Citatione MLA (9a ed.)Khan, Inayat. Suitability of Teaching Eng. Thro` Coresspondence. Ashish, 1985.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.