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(2022, December 01). Clay, Sir Charles Richard, (born 18 Dec. 1965), Management, Portland Community College, since 2003. WHO'S WHO & WHO WAS WHO. Retrieved 1 Oct. 2023, from https://www.ukwhoswho.com/view/10.1093/ww/9780199540884.001.0001/ww-9780199540884-e-295361.

"Clay, Sir Charles Richard, (born 18 Dec. 1965), Management, Portland Community College, since 2003." WHO'S WHO & WHO WAS WHO.  December 01, 2022. Oxford University Press. Date of access 1 Oct. 2023, <https://www.ukwhoswho.com/view/10.1093/ww/9780199540884.001.0001/ww-9780199540884-e-295361>

"Clay, Sir Charles Richard, (born 18 Dec. 1965), Management, Portland Community College, since 2003." WHO'S WHO & WHO WAS WHO. 1 Dec. 2021; Accessed 1 Oct. 2023. https://www.ukwhoswho.com/view/10.1093/ww/9780199540884.001.0001/ww-9780199540884-e-295361.