Where can i buy a factory repair manual for a 1993 Subaru Legacy?

I read the reviews on the Chilton and they are very negative. I also read the the Haynes manuals are not good either. So instead of waisting time with aftermarket manuals, I need a factory manual. As need one that is intended for a factory mechanic to use in order to do complete troubleshooting and repair. One that tells me everything about my car. Thanks.