I would not look at either of those books when coming up with what an old bike sells for. They are way off most time on real world values.
Best thing to do is look at ebay, craigslist, etc. to at least see what the asking prices are. Then come here to get some real world opinions on the value of the bike in question.
1993 Ducati 900SS
1976 Honda CB400F Original Survivor
1973 Honda CL350