Richards, J., & Long, M. (1990). Breakthrough: A Course in English Communication Practice.Workbook. Oxford: Oxford University Press.
استشهاد بنمط شيكاغوRichards, J.c., و M.n Long. Breakthrough: A Course in English Communication Practice.Workbook. Oxford: Oxford University Press, 1990.
MLA استشهادRichards, J.c., و M.n Long. Breakthrough: A Course in English Communication Practice.Workbook. Oxford: Oxford University Press, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.