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BP. Oxford Reference. Retrieved 20 Jan. 2021, from https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095522851.

"BP." Oxford Reference. . . Date of access 20 Jan. 2021, <https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095522851>

"BP." Oxford Reference. ; Accessed 20 Jan. 2021. https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095522851.