Pearson, C. (1977). Getting down to business in english. Heinmann Educational Books.
Citazione stile Chigago Style (17a edizione)Pearson, Christopher. Getting Down to Business in English. London: Heinmann Educational Books, 1977.
Citatione MLA (9a ed.)Pearson, Christopher. Getting Down to Business in English. Heinmann Educational Books, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.