olemus
kirjalik saadetis

ISO 5127:
tekstsõnum, mis on selgelt adresseeritud
mingile isikule või organisatsioonile
=
textual communication carrying an explicit addressing to a person or an organization

ülevaateid
https://en.wikipedia.org/wiki/Letter_(message)

http://howtowritealetter.net/

https://ca.indeed.com/career-advice/career-development/letter-types

https://www.universalclass.com/articles/writing/business-writing/formats-for-different-business-letters.htm

https://www.aplustopper.com/official-letter/

https://www.examples.com/business/official-letter-sample.html

vt ka
- kinnituskiri (1)
- kinnituskiri (2)
- nigeeria kiri
- saatekiri
- volikiri
- ärikiri