To install BooksJS we just need to import PDF.js script and BooksJS script.

Add this before you Initialize BooksJS:

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<script src="https://mozilla.github.io/pdf.js/build/pdf.js"></script>
<script src="https://booksjs.github.io/books/js/books.min.js"></script>

To Initialize BooksJS we only need to use the booksJsLib function.

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var init = booksJsLib('pdf_path_or_url');

pdf_path_or_url is the path pointing to the file.