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An article by the National Center for Transgender Equality defining nonbinary as a gender identity, and giving tips on how to be respectful and supportive of nonbinary people.
A research paper making the case for how a framework for a relationship and pornography scholarship could be organized into 5 different areas.
https://www.tandfonline.com/doi/full/10.1080/00224499.2019.1698003/
An article from The Trevor Project on the definition of gender and differing gender identities.
https://www.thetrevorproject.org/resources/article/understanding-gender-identities/