: Conducted by Advocates for Trans Equality, this is the largest survey ever performed regarding the experiences of transgender people. It covers topics like education, employment, health, and family life for over 92,000 individuals. Historical and Cultural Context
: 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.
Here are several highly regarded articles and resources that offer comprehensive insights: Fundamental Concepts and Identity