Hi there!
There are different formats of citing a URL, and it varies by your area or school district.
Here are a couple if types :
-MLA citations
-only link
-college citations
It's best to ask a teacher at your school what citation method they prefer. Different schools and districts require different formats.
Hope this helps!
Is this a book or no cause you made it sound very confusing
I believe that flashbacks could be used to slow the pace of a story. If you are telling one story, and then decide to introduce a flashback, that would only slow down the story you are already telling.