Indeed, it is probably the single most important source of information.

I haven't been dependent on a single source of information for.

The state is the most important single source of income for the older age groups.

But this time it didn't come from a single source.

One senior official said the information came from a single source.

If he was married, why is there not a single source that says so?

Gradually they both moved away from the single source of light.

Oil is the biggest single source of the world's energy.

All of which could well be from a single source.

In fact, most of ancient history is based on single sources.