Richards,J. C. (1977). Breakthrough: A course in english communication practice. Oxford University Press.
Citazione stile Chigago Style (17a edizione)Richards,J. C. Breakthrough: A Course in English Communication Practice. kuala Lumpur: Oxford University Press, 1977.
Citatione MLA (9a ed.)Richards,J. C. Breakthrough: A Course in English Communication Practice. Oxford University Press, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.