You can export IBA ebook format to IBOOKS format using iBooks Author. No other programs seems to be able to perform the conversion.
Convert iBooks Author e-book to iBooks e-book.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software - convert iba to ibooks on OS X
iBooks Author is used to create multi-touch e-books for Apple iPad.
Convert from iba file
|Yes, iBooks Author supports iba file conversion as a source file type.||Yes||Yes||iba editor||No||No||No||No|
to ibooks file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.