If I had to choose between I. Press' "Grammar of Modern Breton" and McKenna's Handbook, I probably would go for Press' grammar. It also gives an introduction of the different orhographic systems and the dialectal variations used by Breton writers and supplies the reader with quite a lot of texts of all kinds and orthographies, some even with a phonetic transcription, which is especially useful for those not in contact with native speakers. By the way, there is also a vocabulary included, so if you are getting in touch with Breton as a pure beginner (as I am) you do not have to look for an (expensive?) dictionary at the same time. Nevertheless Press' grammar is sometimes a bit difficult to read, due to many abbreviations in the interlinear lines which are only resolved in an appendix. (But if I were rich I would have both!) Johannes Heinecke