Howdy Aydin,
Thanks for using the Apple Support Communities.
To export books you've created in iBooks Author to your iPad, then you will need to follow the steps outlined below:
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With the book open, choose Share > Export, and click iBooks.
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If you want to submit the file to the iBooks Store, click the disclosure triangle next to iBooks Store Options and follow the onscreen instructions.
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Click Next.
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Type a name for the book, choose a place to save it, and click Export.
To view the book in iBooks for iPad or iPhone, make sure you have latest versions of iBooks and iOS installed, and do one of the following:
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Email the file and open it in Mail on an iPad or iPhone. Tap the file to open it.
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Drag the book file (with the extension .ibooks) to the iTunes window and sync the book to your iPad or iPhone. For more information, see iTunes Help.
To view the book in iBooks for Mac, make sure you have the latest versions of iBooks and OS X installed, and do the following:
Drag the book file (with the extension .ibooks) to iBooks.
Export your book for iBooks or in another format
To export in ePub follow these directions:
If you created a book using an ePub template, you can export it to an ePub file.
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In the ePub template, choose Share > Export, then click ePub.
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Click Next.
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Type a name, choose a location for the file, and click Export.
If you have further questions about using iBooks Author, then I recommend you take a look at the iBooks Author help as linked to above.
Take care.