Voice Impacts

https://www.ethos3.com/2015/10/how-your-voice-impacts-your-public-speaking-success/

Body Language Secrets - Documentary

https://youtu.be/IqsAhmTn7n4

7 Principles...

http://www.amanet.org/training/articles/Seven-Principles-of-Effective-Public-Speaking.aspx

Read #1, #2, and #7 again.

Levels of Formality

https://www.espressoenglish.net/formal-semi-formal-and-informal-english/

https://2qdocg2za8g336a8w21fo83z-wpengine.netdna-ssl.com/wp-content/uploads/2014/02/Webinar-Formal-Informal-English.pdf

Choosing Appropriate Vocabulary

https://www.ethos3.com/2012/04/choosing-appropriate-vocab-in-presentations/

Understanding Your Audience

https://www.boundless.com/communications/textbooks/boundless-communications-textbook/analyzing-the-audience-7/the-importance-of-audience-analysis-37/the-benefits-of-understanding-your-audience-161-8007/

A Few Tips...

http://www.selfgrowth.com/articles/Evans24.html