There are many different types. There is the previously mentioned haynes or chiltons. Then there is the Jeep Bible. Also there are factory service manuals. Depends on what exactly you are doing and what you want to pay.
1978 CJ7, frame off rebuild, NV3550, Dana 300(twin stick with a sight tube), I6(258), Dana 44 Scout Axles with 4.09 gears, truetrac LSD. The rest yet to be decided.