1. Whitmell, C.: Business writing essentials: how to write letters, reports and emails. Kindle edn. Clare Whitmell (2013)
2. Hudson, R.A.: Sociolinguistics, 2nd edn. Cambridge University Press, Cambridge (2001)
3. Wang, L., Zhang, F.: Conceptualizing and theorizing business english as a sub-discipline. Foreign Lang. Res. 3, 63–66 (2016)
4. Young, D.J.: Business English: Writing for the Global Workplace. McGraw-Hill Higher Education, New York (2008)
5. Ellis, M., Johnson, C.: Teaching Business English. Oxford University Press, Oxford (1994)