Read this excerpt from henry ford’s autobiography my life and work.

the year from 1902 until the formation of the ford motor company was practically one of investigation. in my little one-room brick shop i worked on the development of a four-cylinder motor and on the outside i tried to find out what business really was and whether it needed to be quite so selfish a scramble for money as it seemed to be from my first short experience. from the period of the first car, which i have described, until the formation of my present company i built in all about twenty-five cars, of which nineteen or twenty were built with the detroit automobile company. the automobile had passed from the initial stage where the fact that it could run at all was enough, to the stage where it had to show speed.

which is the best source to use to confirm the information in this excerpt?

a video of a modern automobile being assembled
a book about the founding of the ford motor company
a website rating the cars of the ford motor company
a magazine article comparing fords to chevys