Actually I am teaching both pd and glicol in the University of Oslo this semester. It's even quite surprising to me that most students seem to gain more logic programming ideas from pd (such as the counter and metro controlled sequencer) while learning more dsp from glicol and its browser console based docs: https://glicol.org

Of course, Miller's book is always there http://msp.ucsd.edu/techniques.htm and the examples are in pd, which is always helpful for learning dsp.