There are several Articles about Hip/Valley Timber Framing in the Timber Frame Joinery & Design Workbook (Volume One) (the red one).
It also has information on the Hawkindale Angles for the same roof. Worth the money. I assume the new Volume has equally good information.
Another good book about roof framing is The Roof Framer's Bible from Amazon. It is more specific to stick framing, but will help with the offset hips of a Bastard Roof (having different pitches on adjoining slopes).