Richards, J. C., & Long, M. N. (1990). Breakthrough 1, 2 & 3: A course in english communication practice (workbook) (New editions.). New York: Oxford University Press.
Chicago Style CitationRichards, J C., and M. N. Long. Breakthrough 1, 2 & 3: A Course in English Communication Practice (workbook). New editions. New York: Oxford University Press, 1990.
MLA CitationRichards, J C., and M. N. Long. Breakthrough 1, 2 & 3: A Course in English Communication Practice (workbook). New editions. New York: Oxford University Press, 1990.
Warning: These citations may not always be 100% accurate.