Documentary Sources- books, journals,magazines of any format
Institutional Sources- school /colleges, govt. offices, NGOs
Human sources- Govt. official, elite group,religious/holy priest
Virtual sources- web sources
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some sources of data are information
multiple sources
In engineering you can use items around the workshop such as posters on info boards or their may already be drill and hole sizes for tap for example a 6.8mm drill bit for a M8 tap on a technical drawing or bend tolerences for the materials thickness.
a primary source would be first hand from an educated certified doctor or something like that. a secondary source would be information from someone...like me!
AnWhat is a good initial technique to apply when proofreading an email?