What are the five major types of reference sources?

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Tags

1. #including
2. #handbooks
3. #biographies
4. #contains
5. #bibliographies
6. #examples
7. #encyclopedias
8. #different
9. #chronologies
10. #atlases
11. #dictionaries
12. #indexes
13. #almanacs
14. #directories
15. #reference
16. #sources
17. #definitions
18. #types