Hi TGT,
I wrote a non-fiction book for asexuals, called Asexual Perspectives 47 Asexual Stories, Love, Life and Sex, ACElebration of Asexual Diversity. It is out on Amazon and I interviewed 46 asexuals across the globe and asexual spectrum for it. There is at least one biromantic in it. It is a long book but each interviewee has a chapter just for them so it’s easily readable and digestible, and does not just tell you text book definitions of asexual identities and the range of thoughts and feelings across the spectrum, but shows you them through their answers.
Sandra