You can copy the texts from an iBook using the following steps:
Open iBook app on your device | open the iBook that you are reading or want to copy the texts from
Highlight the texts that you want to copy (You can highlight the texts in iBook by tapping and holding on a word for few seconds and then moving your finger all the way till the last word you want to highlight.)
Once the texts that you want to copy is highlighted, tap on the highlighted text again
You will now see a set of Annotation tool bar... | Tap on the Arrow icon as shown below
You can now see a set of sharing icons: Mail, Message, Twitter, Facebook and Copy
You can copy the texts that you have highlighted and use it anywhere you want to...
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