Greetings @rachel31,
Apologies, I’m also a bit unclear about what you are asking. Like Amethyst said, the vast majority of spells on Spells8 have been crafted by a team of witch contributors- they are unique to the Spells8 Collection and won’t be found in outside books.
That being said, many of us are avid readers of magickal materials both on and off the site- if you are interested in talking about witchy books, I recommend you check out the Books Tag here in the forum as well as the Book Club! 
Blessed be!