You can order The Trinity Hurdle as a paperback through the publisher, Wipf and Stock http://wipfandstock.com/the-trinity-hurdle.html or as a Kindle ebook through Amazon http://www.amazon.com/dp/B01BO8K2UE
Through this site I am a member of the Fellowship of Christian Bloggers.
Check them out: http://www.focbonline.com.
If you are interested in finding out more about Christadelphians, check out http://www.christadelphianresearch.com/ which is a site set up to provide information, both research and experience-based, on the distinctives of the group, both positive and less so.
Another helpful site, written to respectfully challenge Christadelphians on some matters of doctrine in a biblical scholarly way is http://www.dianoigo.com/index.html