| derivative research(noun, expression, source, research, document) |
| secondary work(noun, expression, source, research, document) |
| encyclopedia(noun, source, research, document, recording) |
| newspaper article(noun, source, research, document, recording) |
| research(noun, source, document, recording) |
| tertiary source(noun, expression, source, research, document) |
| written commentary(noun, expression, source, research, document) |
| article(noun, source, research, document, recording) |
| document(noun, source, research, recording) |
| essay(noun, source, research, document, recording) |
| work(noun, source, research, document, recording) |
| critical essay(noun, expression, source, research, document) |
| study of past events from the perspective of a later period of time(noun, expression, source, research, document) |
| derivative information(noun, expression, source, research, document) |
| document that draws on primary sources(noun, expression, source, research, document) |
| encyclopedia article(noun, expression, source, research, document) |
| journal article(noun, source, research, document, recording) |
| magazine article(noun, source, research, document, recording) |
| recording(noun, source, research, document) |
| source(noun, research, document, recording) |