What is formality?
Formality is is a strict following of established rules or customs.
Despite the arrival of the Internet and its repercussions, letter writing is still a significant tool in written commmunication.
BBC’s Bitesize: Formal and informal writing revision
Oxford University Press Resources:
levels of formality
Esspresso English – Levels of formality
Unilearning – Checklist of language to avoid in academic writing
Target Training – Writing Emails: 20 phrases for closing an email
Avoiding clichés -SkillsYouNeed.com