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Sabri Berkel. Oxford Reference. Retrieved 30 Jun. 2022, from https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095500604.

"Sabri Berkel." Oxford Reference. . . Date of access 30 Jun. 2022, <https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095500604>

"Sabri Berkel." Oxford Reference. ; Accessed 30 Jun. 2022. https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095500604.