I'm currently taking a research class at my local college. I would like to do an essay on linguistics, if my teacher would allow it. But I haven't asked her if I can take that topic, because I don't know what I could cite as sources. Most of what I know has come from wikipedia, my own assessments, and discussions with other linguists. The closest thing to an actual linguistic book I've read is the LCK, the Advanced Language Construction, and recently The Art of Invented Languages. Seeing as David Peterson has a master's degree, I would assume that book is reliable, though I don't know how much 'linguistic' material I could actually get out of it.