Try this web site: http://www.mtn.org/bungalow/articles/docs/bungalow_pride.html
The Twin Cities Bungalow Association has a book for sale that I believe is mostly plans for adding rooms, finishing basements, attics, etc. I don't know how much general renovation it covers. It is $15 I think.
We just bought a 72-year-old bungalow that also has quite a few problems. I am thinking of ordering it because we are looking to replace a wall that has been removed in our house and possibly add a bathroom.
I do have one issue of American Bungalow and it is a great resource for products like wallpaper, hardware,etc. and other books on bungalows. You can order a single issue or a subscription at their web site. The magazine itself does not cover much renovation. I have their coffee table book which I use as reference for decorating.
Old House Interiors is also an interesting magazine that usually includes bungalows each month. It is also primarily decorating but a good source for lighting, tile, etc. like American Bungalow. I have also checked some books at the library book they have mostly included studies of the style or floor plan books.
Sherwin Williams has a line of paint called Craftsman Colors, I think which I found useful in getting a better idea of interior color schemes.
I am currently looking for resources on bathrooms. Please let me know if you find anything else.