I am a former securities regulator, registered stockbroker, and consultant with an expert-level knowledge in the use of Microsoft Excel, Word, and PowerPoint. I have an undergraduate degree from Stanford and an MBA from Wharton.
You can buy any of the listed books in ebook format directly below. They are also available on Amazon.com, Barnes & Noble, Apple, Kobo, and through your local library. If you'd prefer to buy print versions of these books they can be found on Amazon and Barnes & Noble for $12.95 USD.