The easiest way to submit a request for a physical item like a book or DVD is to find the book in WorldCat and click the red "Get It" button that appears on the right side of the record. This will auto-populate the ILLiad request form (shown below) with all the necessary information, and all that's left for you to do is add a needed-by date (if you have one) and any additional notes about your request.
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You can also submit a request directly in ILLiad without going through the catalog.
From the ILLiad home page, click New Request, then Book/Media. The form will look something like this:

From here, you can fill in all the information you know about the item. Only the title and author are required; however, adding more information speeds up the process and ensures that you get the right edition that you're looking for. If you have a specific date you need the item by, you can enter that in the "When do you need this by?" box farther down the form. There is also a notes field where you can add any additional information about your request, such as "I am looking for the Japanese translation of this" or "Bucknell has this as an eBook, but I would prefer a print version".
If you are requesting a different format of an item Bucknell already owns, be sure to write that in the notes section. We're happy to get alternate formats for you, as long as we know that's what you want!