Indexes are _______.
A: primary sources
B: secondary sources
C: tertiary sources
A: primary sources
B: secondary sources
C: tertiary sources
举一反三
- Papers in a journal are ______. A: primary sources B: secondary sources C: tertiary sources
- Secondary sources are considered to be the most reliable.
- What are the main sources of marketing research information？: higher research|primary research|secondary research|thirdly research
- Primary sources are documents, reports, recordings, or other sources of information that are created most probably through__________ and_________ .
- What are the primary sources of British law?