Secondary1. textbooks
Primary. 2. court records
Primary. 3. surveys
Secondary 4. dictionaries
Primary. 5. studies published in academic journals
Secondary 6. magazines
Tertiary. 7. abstracts
Tertiary. 8. indices
Secondary 9. newspapers
Primary. _ 10. diaries
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Secondary1. textbooks
Primary. 2. court records
Primary. 3. surveys
Secondary 4. dictionaries
Primary. 5. studies published in academic journals
Secondary 6. magazines
Tertiary. 7. abstracts
Tertiary. 8. indices
Secondary 9. newspapers
Primary. _ 10. diaries