What Confessions Deal with Discipleship?

In the last few days I've been looking seriously into the idea of discipleship. I've been greatly helped by the late James M. Boice's book Christ's Call to Discpleship and am looking forward to reading Ancient-Future Evangelism by the late Peter Webber. So in my reading I wonder: what church confessions specifically deal with the issue of disipleship? Let me know in the comments. Maybe I've missed something.