Alan Rosenthal's WRITING, DIRECTING, AND PRODUCING DOCUMENTARY FILMS (Southern Illinois U. Press, 1990) is very much worth looking into. You would probably want to select sections of it as it is quite detailed, and at times complex. It is not heavy on technical nitty-gritty; that you can find other places. Rosenthal's other books (THE NEW DOCUMENTARY IN ACTION, THE DOCUMENTARY CONCIENCE, and NEW CHALLENGES FOR DOCUMENTARY) have a number of production-related pieces for which the films are generally available. Again, it would take some selecting to build a suitable set of materials, but his stuff is good and I don't know of anything more concise (unfortunately). (OK, so he's a friend---but I don't owe him money!!)