Further reading:

 Asexual

• /r/asexuality wiki: What is asexuality?
• /r/asexuality wiki: Definitions of terms
• AVEN
• Trevor Project - Asexual

 Non-binary

• Gender Spectrum - Understanding Gender
• Gender Spectrum - The Language of Gender
• So Your Child Is Non-Binary: A Guide For Parents
• Wikipedia - Non-binary gender
• Understanding Non-Binary People
• Wikipedia - Gender dysphoria
• Decent primer on HRT
• The Future of Sex and Gender in Psychology [PDF]