Ford made an operator's or owner's manual for every model they manufactured in that time frame. If you can find one of these for a 39 Standard model, it will give you most of the model specific information on maintenance, lubrication, and operation of that model along with some good pictures, drawings, and diagrams. Ford maintenance manuals were not as model specific as the operator's manuals were but will give an overall instruction for maintenace and overhaul of the Ford models in the range of years it was made to cover.
Kerby
Post Script: The term Reference Manual was used from 36 thru 42. You would be looking for "Ford Passenger and Commercial Reference Book 1939" to cover the standard models for 1939. The Deluxe had its own manual that year.