Ecclesiology: what to read?

I was extremely grateful for all your help with my recent request for readings on pneumatology. So I thought I’d ask for your help, learned friends, once again: what are the best things to read in a course on ecclesiology? It’s a first-year subject, so I’m aiming for a fairly broad range of topics (e.g. mission, liturgy, ecclesial ethics). And I’m aiming for a selection of texts from various times and traditions (I’m thinking of using Augustine’s City of God as the point of departure). Again, I’ll be selecting about 20 or 30 short readings – so any suggestions would be very welcome!

Incidentally, I was talking with a Catholic friend yesterday about course revisions. He told me that he was once appointed to teach a particular theology course – but after reading through the course outline and textbook, he decided: “I’m going to go to hell if I teach this.” I found this remark to be very instructive and very edifying.