Thanks for the links and tips! I seem know how to use this two things.
There is actually one another method that no one has mentioned yet. You can put both the author and the clickable source link in your quotes, like this:
Bitcoin is an electronic payment system created in 2009. It allows you to send money to anyone in the world, and you don’t need to ask anyone’s permission to create an account
[quote="[url=https://learnmeabitcoin.com]Greg Walker[/url]"]Bitcoin is an electronic payment system created in 2009. It allows you to send money to anyone in the world, and you don’t need to ask anyone’s permission to create an account[/quote]