: Published by the American Psychological Association (APA) , this guide provides clear definitions of gender identity, gender expression, and the distinction between transgender and cisgender identities.

: This overview on Wikipedia documents the long history of gender diversity across cultures, from the Navajo nádleehi in North America to traditional roles in various African societies.

: The Center offers a breakdown of the LGBTQIA+ acronym, explaining how transgender identity intersects with sexual orientation and other community labels. Lived Experiences and Statistics