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Sigmund Freud

https://en.wikipedia.org/wiki/Sigmund_Freud

https://en.wikipedia.org/wiki/Id,_ego_and_super-ego

https://www.sas.upenn.edu/~cavitch/pdf-library/Freud_SE_Ego_Id_complete.pdf

https://en.wikipedia.org/wiki/Fixation_(psychology)

https://www.merriam-webster.com/thesaurus/fixation

https://www.mind.org.uk/media-a/2943/ocd-2019.pdf