What Plug in to Cite Source Blog

I am trying to figure out if there is a plug in or what that does this. Sites like ezinearticles does it and also blog.hubspot.com does it.
when you copy any text from the blog, when you paste it, it says it came from that blog. for example:
“
YouTube has surpassed the 3 billion views-per-day mark. This accounts for a 50% increase over views last year.

Read more: https://blog.hubspot.com/blog/tabid/6307/bid/14881/YouTube-Celebrates-6th-Birthday-With-3-Billion-Views-Per-Day.aspx#ixzz1RWlmNafe
“

Wondering how to do that. Could not find a name for the plug in.
thanks