Part of Prentice Hall's Primate Field Studies series. Apes of the Impenetrable Forest (The Behavioral Ecology of Sympatiric Chimpanzees and Gorillas) offers students a scholary and relevant study.
It has a painfully slow start, but after that it's great, the middle, is interesting, with exciting descriptions of the data acquisition and personal experience with the apes. The book concludes with a concise and short summary of the results, as well as its implications for the survival of early sympatric hominids.
This short book in the "Primate Field Studies" series was really interesting as long as Stanford was describing the origins of his project and the challenges of starting it up and getting it going. It seriously loses steam when it gets to research results. Perhaps he felt too inhibited by trying to make them accessible to an undergrad audience?