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With proper references and credits.

Edit: I am using couple of pictures, one as an e-book cover and the rest for decorating the head of various chapters. The pictures are insignificant for the scientific e-book.

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No, you cannot put additional restrictions on the picture, and re-licensing it with a 'non-commercial' restriction would be incompatible with the 'share alike' in the CC BY SA 4.0 terms. The definition of 'Adapted Material' in the license language of CC BY SA 4.0 is very broad. Your book would be 'Adapted Material' according to the license terms and therefore would need to be following the 'share alike' requirement, so with the same license or any of the compatible licenses. Please see also the FAQ.

Martin_in_AUT
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    I am using the pictures as a book cover and decoration for various chapters in the e-book. According to your answer, I either need to degrade the license to CC BY-SA or replace these (quite insignificant) pictures with own taken pictures. – Atiyah Elsheikh Sep 21 '21 at 09:33
  • after reading the following thread: https://opensource.stackexchange.com/questions/9216/using-cc-by-sa-images-in-a-cc-by-nc-sa-document, I am not so fully sure since the e-book "as a whole" is not yet a derivative of any of the images – Atiyah Elsheikh Sep 21 '21 at 09:51
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    I really appreciate your effort of doing it right and understanding the legal situation. The case "Drauglis v. Kappa Map Group, LLC" mentioned in the other thread linked above refers to pictures licensed under CC-BY-SA-2.0 which includes the concept of 'Collective Work', and this was imho applied by the judge in the court case. 'Collective Work' has disappeared in CC-BY-SA-4.0, so your situation now is not fully comparable. – Martin_in_AUT Sep 21 '21 at 10:48