Question about bibliographical references

I'm translating a book, but this book has a lot of long textual quotes from other books. What is the right way to approach this ? Right now I'm translating the textual quotes along with the other book content and then in footnotes I'm writing : Translated to Spanish by: (my name) Original in Englis: and then the full original english quote. But they're too long, is this the right way to do this?
Thanks in advance,
Khaxan

Be careful that you are citing facts and not opinions when using blogs; a lot of stuff written on them is made-up. Your teacher could mark you down for this.

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