Gazelle : The Palestinian Biological Bulletin (ISSN 0178 – 6288) . Number 159 , March 2018 , pp. 1-22 | Page 22

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Wikipedia. Ola Khalaf‟s Nudibranch. ‫الخياشيم‬ ‫عاري‬ ‫خلف‬ ‫عال‬ ‫بحر‬ ‫بزاق‬ . (In Arabic).
https://ar.wikipedia.org/wiki/%D8%A8%D8%B2%D8%A7%D9%82_%D8%A8%D8%AD%D8
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Gazelle : The Palestinian Biological Bulletin – Number 159 – March 2018