【多选题】What sources of secondary data do we often have access to for business research?
A.
Internal sources including profit-and-loss statements, balance sheets, sales figures, inventory records,customer details, employees’ files, previous marketing research studies and the like.
B.
External sources including government sources such as Statistical Yearbook of China
C.
External sources including corporate filings such as annual reports of listed companies
D.
Media and published materials
E.
Corporate filings such as annual reports of trade, business and professional associations