916 info
For 916 history and full production figures try "Ducati 916" by Ian Falloon (2001), published by Haynes Publishing, ISBN 1 85960 689 X.
Incidentally, I am looking for a copy of "Ducati Twins Restoration Guide:Bevel Twins 1971-1985" by the same author, which is no longer available from Haynes, if anyone has one.